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Guide to head gasket sealants

Charlotte Phillips, 2 months ago

3 min read

  • Advice
  • Repair
Head gasket image

WhoCanFixMyCar discusses when you need to use head gasket sealant and what the best head gasket sealers you can find on the market are

Your car's head gasket is a fairly vital component that you probably don't think about until a problem comes along. Over time your head gasket can become damaged and as a result can begin to lose compression, meaning both coolant and oil can leak into the cylinders.

Head gasket repairs can be costly procedures, and that's why you might want to try rectifying the problem with the help of head gasket sealant.

Contents:

What is head gasket sealant?

Do head gasket sealants really work?

What is the best product to seal a head gasket?

How long does head gasket sealer last?

Where do you put head gasket sealant?

Will head gasket sealer stop an oil leak?

Is head gasket sealer worth it?

Will head gasket sealer ruin an engine?


What is head gasket sealer?

Head gasket sealant is a fluid which re-seals leaks on a damaged head gasket.

The function of your head gasket is to seal the internal combustion gases within the cylinders and to allow coolant and oil to move throughout the engine, keeping it cool and lubricated by preventing leaks from occurring.

If there is a leak or issue with your head gasket, the issue should be dealt with promptly to ensure that no more problems occur. You have likely heard the term ‘blown head gasket’, and when this happens, it could spell trouble for your engine. Luckily, it’s often very simple to identify the symptoms of a blown head gasket, so if you ever find yourself in this unfortunate position, you will likely be aware of it quickly. Head gasket sealer ultimately acts as a stop-gap solution for a leaking head gasket, preventing any further damage from occurring.


Do head gasket sealants really work?

Yes! A head gasket sealer will work in the way it should if the sealant is of a good quality, if the sealant has been applied correctly, and if the correct amount of sealant has been used for your engine. 

The amount of sealant you need to use will depend on the size of your engine. For example, cars with four or six cylinders will generally need to use less sealant than those with eight or 10 cylinders.

Head gasket sealer is a good, but sometimes temporary fix to what could be a larger problem. It could be that your head gasket is damaged beyond repair, and in this instance, you should take your car along to the garage for a specialist head gasket mechanic to diagnose how serious the problem is for you.


What is the best product to seal a head gasket?

There are many different types of head gasket sealer on the market, so it can be difficult to choose the right one for you. Below you can find the top three rated head gasket sealants available.

  • BlueDevil Head Gasket Sealer

  • Steel Seal Head Gasket Repair

  • K-Seal ST5516 HD

These three different sealers are all simple to use solutions from well established brands, and depending on your exact needs, you should find top results from using each of them to seal up your head gasket. Prices will vary from store to store, so be sure to shop around for the best price.


How long does head gasket sealer last?

How long your head gasket sealer lasts will depend on the extent of the damage to your head gasket. Different brands of head gasket sealer are made with different components, and as such, some will last longer than others depending on how your car takes to them. Whilst head gasket sealant can offer a permanent fix to minor leaks, more severely damaged head gaskets will last for only up to six months.


Where do you put head gasket sealant?

Head gasket sealant should be introduced to the coolant system through either the radiator cap or the expansion bottle depending on the type of car you own. Always make sure the engine is cool before you start.


Will head gasket sealer stop an oil leak?

Yes, leaking oil can be found when your car is suffering from head gasket problems. Head gasket sealant helps to repair and reseal the damaged areas, preventing future leaks from occurring


Is head gasket sealer worth it?

Head gasket sealer is completely worth purchasing, depending on the extent of the damage to your head gasket. A blown head gasket can be a costly problem to fix, so the best way to avoid the problem with your head gasket from becoming any worse is to use a head gasket sealer.


Will head gasket sealer ruin an engine?

No, if the right kind of head gasket sealer is used correctly, it won’t cause any damage to your engine. Using head gasket sealant is a fully safe way to re-seal your head gasket without having to pay for costly head gasket replacement repairs.


Just like many things, using head gasket sealant can be just a temporary solution to the problem, particularly if the damage to your head gasket is more severe. If you’re not sure on the extent of the damage, the best course of action is to find a head gasket specialist who can diagnose and repair the problem for you if necessary.

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