Can you Drive with a Blown Head Gasket?

 

can you drive with a blown head gasketIf you’re asking yourself “can you drive with a blown head gasket”, then you either have a blown head gasket already or you drive a vehicle that is known for blowing head gaskets.  If you’re driving a vehicle that is known for blowing head gaskets, you may be able to do a few things to prevent that from happening to you.  For more information, check out our article about preventing a blown head gasket.

If you’ve already got a blown head gasket, you need to understand what is actually going on in your motor to understand why it’s a bad idea to drive with a blown head gasket.  The head gasket in your car is sandwiched in between your engine’s block and the cylinder head forming part of the combustion chamber.  Its job is to keep compressed air and fuel inside the cylinder so it can be ignited and turned into energy and to keep coolant and oil out of the combustion chamber so they don’t foul the ignition process and so your vehicle doesn’t lose fluids.

When your head gasket is blown, it allows one or more of these fluids or gases to get to a place they shouldn’t be.  A blown head gasket can allow combustion gases to get into your coolant, engine coolant to get into the combustion space or the oil and allow engine oil to get in all of these places as well.  The real danger of driving with a blown head gasket is really the danger of driving with your engine’s fluids and gases in the wrong places.

Allow coolant into the combustion space can cause lots of problems.  First, it can foul spark plugs and make your engine run poorly due to the deposits left by burning coolant.  Next, coolant in the combustion chamber can change air fuel ratios and cause damage to sensors.  Lastly, and possibly most hazardous to your engine, having coolant in the combustion chamber can cause rusting of the piston, piston ring and cylinder wall which can lower compression and require and engine rebuild.

Next, you could end up with coolant in your engine oil either by seeping past your piston rings or due to a direct leak from a coolant passage to an oil passage.  Coolant in your engine oil causes major problems as it significantly reduces your engine oil’s ability to lubricate important components of your engine like your cam shaft or crank bearings.  This lack of adequate lubrication can quickly lead to bearing damage again requiring an engine rebuild.

Allowing engine oil to leak anywhere can quickly lower engine oil levels which will also reduce lubrication in your engine and cause the same damage to bearings and camshafts.  Lastly, allowing gases to leak out of your combustion chamber can cause abnormally high pressures in your cooling system and problems in the metal around the leak.  Leaking coolant and combustion gases can cause high temperature gradients leading to erosion of the leak area and possible cracking.

For all these reasons we don’t recommend driving with a blown head gasket.  The good news is there is a quick and easy way to seal your blown head gasket and keep your car on the road.  BlueDevil Pour-N-Go is a specially formulated sealing agent you can add to your vehicle’s radiator that will seal a head gasket leak as you drive.  BlueDevil Pour-N-Go doesn’t take any tools to install and will quickly and easily seal your head gasket leak.

For more information about BlueDevil Pour-n-Go, click on the banner below!
BlueDevil Pour-N-Go Head Gasket Sealer

You can also BlueDevil Pour-N-Go at any of our partnering local auto parts stores like:

  • AutoZone
  • Advance Auto Parts
  • Bennett Auto Supply
  • CarQuest Auto parts
  • NAPA Auto Parts
  • O’Reilly Auto Parts
  • Pep Boys
  • Fast Track
  • Bumper to Bumper Auto Parts Specialists
  • S&E Quick Lube Distributer
  • DYK Automotive
  • Fisher Auto Parts stores
  • Auto Plus Auto Parts stores
  • Hovis Auto & Truck Supply stores
  • Salvo Auto Parts
  • Advantage Auto Stores
  • Genuine Auto Parts stores
  • Bond Auto Parts stores
  • Tidewater Fleet Supply
  • Bumper to Bumper Auto Parts
  • Any Part Auto Parts
  • Consumer Auto Parts

Pictures Provided By:

can_you_drive_with_a_blown_head_gasket.jpg – By Nakata Sahc – Licensed by Getty Images – Original Link

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69 responses to “Can you Drive with a Blown Head Gasket?

  1. Can I use the pour and go head gasket sealer after I already used the pour and go radiator and block sealer? The radiator and block sealer seemed to help so far but I noticed coolant leak under the expansion tank cap- I’m concerned it may be exhaust gases due to head gasket

    1. Charles-

      We recommend flushing the cooling system prior to adding the BlueDevil Pour-N-Go Head Gasket Sealer. A clean, free-flowing system, will give the product the best chance of circulating and sealing properly.
      If you are getting combustion/exhaust gases blowing into the cooling system and creating pressure then we recommend applying BlueDevil Head Gasket Sealer.  To give yourself the best overall chance of BlueDevil working successfully, in addition to the directions, you should remove the spark plug from the cylinder with the leak; this will be the spark plug from the cylinder with the low compression reading.  If you are not sure which one that is, you may pull all of the spark plugs and will notice one will have a white-crystal-like substance on it and/or may look dirty; this is the plug you should pull.  Leave that plug out for the 50 minute idle in order to relieve the pressure from building up and thus allowing the product to seal properly.

      Thank you!

      -BDP

  2. I’m wanting to buy a car and drive it for two hours, from the bought destination to home. The car has a blown head gasket. Engine is a 1.6 16v, I’m thinking of getting it fixed when I get it home. Will your product do this task for me?

    1. Gary-

      As long as the vehicle can maintain idle for a full 50 minutes, without overheating or stalling out, and you are not losing more than about a quart of water/coolant during that 50 minutes, you would be a great candidate for the BlueDevil Head Gasket Sealer (http://store.gobdp.com/head-gasket-sealer-38386/). Feel free to contact our technical support line at 888-863-0426 with any other questions.

      Thank you!

      -BDP

        1. Michael-

          Overall, the product carries a success rate of a little over 90%. Feel free to contact our technical support line at 888-863-0426 with any other questions.

          Thank you!

          -BDP

  3. Ive had my car for about two months. I just found out about a blown head gasket about two weeks ago. I have not driven long distances but I have driven. The car was leaking coolant and needed to be filled with oil as well, all of which was done two weeks ago. Could something worse have happened in the past two weeks?

    1. LeEisha-

      Please contact our technical support line at 888-863-0426 so that we can get a better understanding of the vehicle’s condition and be able to make any appropriate recommendations.

      Thank you!

      -BDP

  4. I have a 2005 yukon that i believe has a blown head gasket. It smokes a little white smoke and no obvious leaks. We can drive it around all day and it uses about half a gallon of water. Can i use your prosuct and be safe to drive this on vacation approx 2000 miles round trip

      1. My 2006 BMW X5 can stay idle for 50min it’s not smoking or leaking but was just told I have blown gaskets some days it runs hot sum it don’t can I use this in my bmw

        1. Dominique-

          Thank you for asking about your BMW X5. The BlueDevil Head Gasket Sealer would not be appropriate to use in a case where you are not losing water/coolant, as the product is intended to seal water/coolant leaks. Please contact our technical support line at 888-863-0426 so that we can get a better understanding of the vehicle’s condition and be able to make any appropriate recommendations.

          Thank you!

          -BDP

  5. Will it work my car ran hot and I think my heads are blown or cracked. I was told that the product will work but don’t know if I am able to drive my 94 Honda Accord back and forth to work.

    1. Tim-

      Thank you for asking about your Honda Accord. As long as the vehicle can maintain idle for a full 50 minutes, without overheating or stalling out, and you are not losing more than about a quart of water/coolant during that 50 minutes, you would be a great candidate for the BlueDevil Head Gasket Sealer. Feel free to contact our technical support line at 888-863-0426 with any questions.

      Thank you!

      -BDP

  6. I have a 1999 Olds 88..My vehicles temp gauge went into the danger are so I stopped and the antifreeze resevoir was empty..So I filled it to the hot line drove about 4 miles to get home..When I got there it was empty again…So I repeated what I did the first time drove it for about 15 minutes. Came home empty again..I have no leaks nothing on the ground so I dont know where all this liquid went..I tried one more time and this time put plain water in resevoir drove it and temp came down..Got home water gone…So I let it sit for a hour remover radiator cap could see no fluid..When I trie to start it it ran really rough and acted like it was going to backfire so I shut it off…

    1. Janice-

      Thank you for asking about your Oldsmobile 88. Based on your description, it sounds like you may be getting water/coolant into the cylinders, causing the really rough start you’ve experienced. Unfortunately, it sounds like you are losing water/coolant a little too quickly for the BlueDevil Head Gasket to be affective. In order to get the benefit of using the product, the vehicle would need to be able to idle for a full 50 minutes, without overheating or stalling out, and you shouldn’t be losing more than about a quart of water/coolant during that 50 minutes. A hard part repair may be your best option.

      Thank you!

      -BDP

  7. I own a 2002 Subaru Outback LL Bean (3.0L 6cyl) and am adding coolant every week, about a cup or more. Have been told by 2 separate mechanics – 1 a Subaru Tech, it’s a combustion problem/internal engine and I should start looking for another vehicle. Repairs would cost $5,000 or more. Mileage is 172,000. Is Blue Devil Gasket Sealer wise to use for a 3.0L 6cyl Subaru LL Bean Wagon?

    1. Richard-

      Thank you for asking about your Subaru Outback. If your mechanics are correct and the vehicle is getting combustion/exhaust gases blowing into the cooling system and creating pressure, we would recommend using the BlueDevil Head Gasket Sealer. 
      To give yourself the best overall chance of BlueDevil working successfully, in addition to the directions, you should remove the spark plug from the cylinder with the leak; this will be the spark plug from the cylinder with the low compression reading.  If you are not sure which one that is, you may pull all of the spark plugs and will notice one will have a white-crystal-like substance on it and/or may look dirty; this is the plug you should pull.  Leave that plug out for the 50 minute idle in order to relieve the pressure from building up and thus allowing the product to seal properly.  Be sure to follow the guidelines for the proper amount to use based on the size of your cooling system; you may only need 8 – 10 ounces of BlueDevil Head Gasket Sealer.

      Thank you!

      -BDP

  8. Do I need to remove the thermostat before I use the blue devil pour and go for a blown head gasket?

  9. My car has been over heating and the coolant was boiling, I was told I have a blow head gasket and I don’t want to replace it is there any chance pouring the pour and how I’ll fix it?

    1. Sienna-

      Yes, there is a good chance that BlueDevil Pour N Go Head Gasket Sealer will fix it. Please contact us at 888-863-0426 so that we may discuss all of the symptoms you have seen. This will allow us to make the best recommendations for applying BlueDevil with success.

      Thank you!

      -BDP

    2. Sienna-

      What kind of vehicle are you asking about? Please contact our technical support line at 888-863-0426 so that we can get a better understanding of the vehicle’s condition and be able to make any appropriate recommendations.

      Thank you!

      -BDP

  10. Hi I have a 2003 chevy Malibu
    And all my mechanics think I have a blown head gasket , the car runs but overheats very quickly ,I have removed the thermostat already . The car starts to smoke when it’s hot and it shuts off when it’s overheated . Is there any hope for my vehicle using your product?

    1. Keda-

      Thank you for asking about your Chevy Malibu. In order to get the benefit of using the BlueDevil Head Gasket Sealer, the vehicle would need to maintain idle for a full 50 minutes without overheating or stalling out, and you shouldn’t be losing more than about a quart of water/coolant during that 50 minutes. Based on your description, unfortunately, it seems the leak you have may be a little more extreme than what the product is intended for. A hard part repair may be your best option.

      Thank you!

      -BDP

  11. Help I think my 2013 Ford Fiestas got a blown head gasket there is white smoke that comes out of the exhaust it overheats and the starter will not let the car start there is milky looking stuff in my oil

    1. Judy-

      Thank you for asking about your Ford Fiesta. Based on your description, it does sound like the symptoms of a blown head gasket. In order to get the benefit of using the BlueDevil Head Gasket Sealer, the vehicle would need to be able to idle for 50 minutes without overheating or stalling out, and you should not be losing more than about a quart of water/coolant during that 50 minutes. Feel free to contact our technical support line at 888-863-0426 with any other questions.

      Thank you!

      -BDP

  12. My Honda civic 2004 runs perfectly. But it subjected to longet trips it gets hit and over heats. I would need to make it cool down and add coolant.
    It would run okay for another 1000km
    But I will need to add coolant again
    Does this frequent coolant addition mean a blown head gasket
    I remember one morning I found coolant leaking after i got to work. I just left it and came back to it at the end if the day…ever since its bn fine.
    What do you recommend.. I need the car running for at least 3more months

    1. Ak-

      Thank you for asking about your Honda Civic. A loss of coolant does not necessarily indicate a blown head gasket. Based on your description, we recommend taking the vehicle to a certified ASE mechanic for a proper diagnosis as to why you are losing coolant.

      Thank you!

      -BDP

  13. I have a 2003 ford explorer. I was told it has a blown head gasket. It loses a fair amount of coolant but doesn’t overheat often. Can I use this product?

    1. Julie-

      BlueDevil should not be added to a coolant reservoir/overflow tank. If your vehicle only has a reservoir/overflow rather than a radiator cap, instead of pouring it through the reservoir/overflow, with the car off and engine cold you should disconnect the top radiator hose and add the product there (it may be added into the hose or through the opening). The speed of the pour will not make any difference as the engine will be off. Once it has been added, reconnect the hose and start the idle from that point.

      Thank you!

      -BDP

  14. I have a 98ford festive i have cooker the engin and the radiator leeks and don’t hold water and there is a knocking sound coming from the engine. There is no water in the oil what can i don

    1. Lachlan-

      Thank you for asking about your Ford Festiva. Typically, the knocking sound you are hearing would mean you have water getting into the oil. How quickly are you losing water? Please contact our technical support line at 888-863-0426 so that we can get a better understanding of the vehicle’s condition and be able to make any appropriate recommendations.

      Thank you!

      -BDP

  15. Will BlueDevil Pour N Go Head Gasket Sealer will work on a OMC marine engine? If it does not, how do you get the BlueDevil Pour N Go Head Gasket Sealer out of the engine and how much residue is left in the engine and where?

    1. Tim-

      Please contact our technical support line at 888-863-0426 so that we can get a better understanding of the engine’s condition and be able to make any appropriate recommendations.

      Thank you!

      -BDP

  16. My 2004 Jeep Grand Cherokee (129K) recently had a little bit of a rough start and then the check engine light came on. The mechanic said the code was for #6 coil. He replaced the coil and spark plug. After 2 days the check engine light came back on. The mechanic performed some tests and said I need to replace the engine ($4,000.). He said that some antifreeze is splashing onto the coil when I turn the car on and that the car would run rough until the antifreeze burned off.

    The car starts and runs fine but I think I am on borrowed time.

    Will this product help here?

    1. Adrian-

      Thank you for asking about your Jeep Grand Cherokee. It sounds like the vehicle is getting combustion/exhaust gases blowing into the cooling system and creating pressure. In this case we recommend applying BlueDevil Head Gasket Sealer (http://store.gobdp.com/head-gasket-sealer-38386/). To give yourself the best overall chance of BlueDevil working successfully, in addition to the directions, you should remove the spark plug from the cylinder with the leak; this will be the spark plug from the cylinder with the lowest compression reading. If you are not sure which one that is, you may pull all of the spark plugs and will notice one will have a white-crystal-like substance on it and/or may look dirty; this is the plug you should pull. Leave that plug out for the 50 minute idle in order to relieve the pressure from building up and thus allowing the product to seal properly.

      Thank you!

      -BDP

  17. I have a chevy silverdo 94 they told me it has a cracked head gasket. Its full of water now but I cant see how much water it uses after the test so after running it idle for 50 minutes Im going to have to pour a quart of water back in to measure. First of all after the 50 minute mark Im going to have to wait for an hour until it cools off but will the measurement be effected by then? If so how should I measure the amount of water being used up as soon as the 50 minute mark is reached?

    1. Abe-

      Thank you for asking about your Chevy Silverado. It is not a requirement to test how much water you are losing prior to using the BlueDevil Head Gasket Sealer. Customers who are seeing the greatest benefit of using the product have vehicles that maintain idle for a full 50 minutes, without overheating, and are not losing more than about a quart of water/coolant during that 50 minutes. It would be tough in most cases to measure exactly how much water you are losing. Feel free to contact our technical support line at 888-863-0426 with any other questions.

      Thank you!

      -BDP

  18. Hello i have a blown head gasket in my 2001 buick century and im thinking of using the product. Should i do a radiator flash first before using it or after. And when you say the car have to stay idle for 50 min do you min the temperature gadge or my car

    1. Marrie-

      You should use BlueDevil Radiator Flush prior to installing BlueDevil Head Gasket Sealer. When we refer to allowing the vehicle to idle for 50 minutes we mean the vehicle should remain stationary with the engine running for 50 minutes.

      Feel free to contact our tech support team at 888-863-0426 with any further questions.

      Thank you!

      -BDP

  19. Hello I have a 99 olds brevada. It keeps losing coolent and runs over 210 when sitting still with the ac going. I googled blown head gasket and it said if you see a white residue under the oil cap it could be a blown head gasket. Will your product help me?

  20. i put water in my radiator and was driving it then my car shut off and wasnt cranking up and it looked liked the spark plugs in the back of my Engine were burning I think I’ve blown A head gasket do you think that this will help it ?

    1. Calvin-

      In order to get the benefit of the BlueDevil Head Gasket Sealer, the vehicle would need to be able to idle for a full 50 minutes without overheating or stalling out, and you shouldn’t be losing more than about a quart of water/coolant during that 50 minutes. Please contact our technical support line at 888-863-0426 so that we can get a better understanding of the vehicle’s condition and be able to make any appropriate recommendations.

      Thank you!

      -BDP

  21. I have a 1987 delta88 I changed the oil and noticed bubbles in the oil.will blue devil head gasket sealer work for this vehicle.

    1. James-

      Thank you for asking about your Oldsmobile Delta. The BlueDevil Head Gasket Sealer is only intended for water/coolant leaks. Unfortunately, we do not manufacture a product for the type of symptoms you have described. We recommend bringing the vehicle to a certified ASE mechanic for a proper diagnosis and possible part replacement.

      Thank you!

      -BDP

  22. If your product is able to seal a cracked head, how does it not seal up the tiny lines running through the radiator?

    1. Shauna-

      The BlueDevil Head Gasket Sealer does not contain any solid or particulate matter, so it will not clog or harm your engine or radiator. The product is attracted to air flow, and works by looking for the temperature differentials in the system and then reacts with heat to form a chemical weld. Feel free to contact our technical support line at 888-863-0426 with any other questions.

      Thank you!

      -BDP

  23. my 17 year old son has a 1996 Volvo 850, it had a coolant leak which we thought was a water pump issue. This past thursday we replace the water pump, timing belt, and drive belt. In flushing the cooling system it appeared to be fine and even test driving the car by the mechanic and my son and I it seemed to be fixed so the next day he drove it to school. When he came home thick white smoke was coming out of the exhaust, his check engine light was blinking, and when I checked under the hood he had absolutely no coolant left. So today I took it back to the shop that replaced his spark plugs and wire and had them check his car and they told me that the check engine code brought up a “cylinder 3 misfire” and after further diagnosis, it was confirmed he had a blown head gasket. I am on the fence about selling it as I don’t think I will get remotely close to the money I put into it and I need this car to either sell for a relatively good profit enough to get him another car or be fixed to last my son until the end of the school year when he graduates

    1. Tammie-

      Thank you for asking about your Son’s Volvo 850. Based on your description, It sounds like the vehicle is getting combustion/exhaust gases blowing into the cooling system and creating pressure. We recommend applying BlueDevil Head Gasket Sealer. To give yourself the best overall chance of BlueDevil working successfully, in addition to the directions, you should remove the spark plug from the cylinder with the leak; this will be the spark plug from the cylinder with the low compression reading. If you are not sure which one that is, you may pull all of the spark plugs and will notice one will have a white-crystal-like substance on it and/or may look dirty; this is the plug you should pull. Leave that plug out for the 50 minute idle in order to relieve the pressure from building up and thus allowing the product to seal properly. Be sure to follow the guidelines for the proper amount to use based on the size of your cooling system.

      Thank you!

      -BDP

  24. Hi I have 96 Honda accord that keeps giving me problems I knew I had a head gasket prob now when I stop at a light or stop sign its sputters and shakes even when I accelerate and white smoke does come from oil cap too…

    1. Jose-

      Thank you for asking about your Honda Accord. Have you noticed a loss of water/coolant? Based on your description, it is possible you are getting water/coolant back into the cylinders, causing it to sputter and shake. Water also may be getting into your oil. Please contact our technical support line at 888-863-0426 so that we can get a better understanding of the vehicle’s condition and be able to make any appropriate recommendations.

      Thank you!

      -BDP

  25. I live in Tampa, Fl and have a 1997 Dodge Van Ram 1500, 5.2L motor 318, 8 cylinders. Yesterday during a working day it overheated badly with fumes coming out of the hood. I was able to stop at a express mechanic shop on the way. The antifreeze reservoir and radiator were empty. Mechanic said it was fault of a bad water pump,. We filled radiator with water,also did some test on top of radiator opening with some tester that showed water turning green and bubbles. He said I have a blown head gasket and need to replace the engine. Will the Blue Head Gasket Sealer work ? I am planning on taking the van to a mechanic for a more accurate opinion and obviously decision. Thank you for your input.

    1. Orlando-

      Thank you for asking about your Dodge Ram 1500. It is possible that you are getting combustion/exhaust gases pumping back into the cooling system. You can use a “Block Dye Tester” to confirm whether or not that is the case.
      BlueDevil Head Gasket Sealer will still work if your vehicle is getting combustion/exhaust gases blowing into the cooling system and creating pressure. To give yourself the best overall chance of BlueDevil working successfully, in addition to the directions, you should remove the spark plug from the cylinder with the leak; this will be the spark plug from the cylinder with the low compression reading. If you are not sure which one that is, you may pull all of the spark plugs and will notice one will have a white-crystal-like substance on it and/or may look dirty; this is the plug you should pull. Leave that plug out for the 50 minute idle in order to relieve the pressure from building up and thus allowing the product to seal properly. Be sure to follow the guidelines for the proper amount to use based on the size of your cooling system.

      Thank you!

      -BDP

  26. I just bought a 1996 Cadillac Deville to help my brother-in-law out since he just moved to the US from Venezuela. Unbeknownst to me the car has just started showing signs of a blown gasket, although secondary’s are minor at this point. Will this product work on a Northstar engine? Only need the car to work for 3-6 months until my B-I-L gets on his feet.

  27. I know I have a blown head gasket on my 97 Ford F-150 with a 4.6 The oil dipstick is over full with brown motor oil. And empty radiator over flow. Container my question is should I warm engine. And drain and add new oil and filter before adding. Your head gasket repair. It also has a skip due to a bad spark plug .

    1. Donald-

      Thank you for asking about your Ford F-150. Based on your description, we recommend changing the oil before and after the BlueDevil process, however, the engine should be cold before adding the product. It is also possible that you are getting combustion/exhaust gases pumping back into the cooling system. You can use a “Block Dye Tester” to confirm whether or not that is the case.
      BlueDevil Head Gasket Sealer will still work if your vehicle is getting combustion/exhaust gases blowing into the cooling system and creating pressure. To give yourself the best overall chance of BlueDevil working successfully, in addition to the directions, you should remove the spark plug from the cylinder with the leak; this will be the spark plug from the cylinder with the low compression reading. If you are not sure which one that is, you may pull all of the spark plugs and will notice one will have a white-crystal-like substance on it and/or may look dirty; this is the plug you should pull. Leave that plug out for the 50 minute idle in order to relieve the pressure from building up and thus allowing the product to seal properly. Be sure to follow the guidelines for the proper amount to use based on the size of your cooling system.

      Thank you!

      -BDP

  28. I am avout to get a 95 Nissan pickup with a blown head gasket. It is a 2.4L inline 4 with 244000 miles. The truck can run for only 30 minutes before it starts getting how and nees to add water. My question is will blue devil head gasket sealant work well enough to let me drive this truck as a daily driver? Also, what if the head is cracked or warped a little?

    1. Mark-

      Thank you for asking about your potential Nissan pickup. The BlueDevil Head Gasket Sealer does treat warped/cracked heads, however, in order to get the benefit of using the product, the vehicle needs to be able to idle for a full 50 minutes without overheating or stalling out, and you shouldn’t be losing more than about a quart of water/coolant during that 50 minutes. Based on your description, unfortunately, it does not seem the vehicle would idle long enough for proper results.

      Thank you!

      -BDP

  29. Hi I drive a Nissan wingroad wagon with a QG 15 engine I started noticing my radiator reservoir was been bubbling after driving, some one told me that’s a sign that my head gasket is blown, but not losing any coolant, and no water in the oil, are these sign of a blown gasket?

    1. Kevon-

      Thank you for asking about your Nissan Wingroad. It is possible that you are getting combustion/exhaust gases pumping back into the cooling system. You can use a “Block Dye Tester” to confirm whether or not that is the case.
      BlueDevil Head Gasket Sealer will still work if your vehicle is getting combustion/exhaust gases blowing into the cooling system and creating pressure. To give yourself the best overall chance of BlueDevil working successfully, in addition to the directions, you should remove the spark plug from the cylinder with the leak; this will be the spark plug from the cylinder with the low compression reading. If you are not sure which one that is, you may pull all of the spark plugs and will notice one will have a white-crystal-like substance on it and/or may look dirty; this is the plug you should pull. Leave that plug out for the 50 minute idle in order to relieve the pressure from building up and thus allowing the product to seal properly. Be sure to follow the guidelines for the proper amount to use based on the size of your cooling system.
      That being said, the product should not be used as a preventative measure. You should verify the problem first to see if it is a candidate for the product. Feel free to contact our technical support line at 888-863-0426 with any other questions.

      Thank you!

      -BDP

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