Engine sealant – how to seal the engine yourself?

Artur Owczarek

Brand Product Manager Moje AutoHe has been involved in the automotive industry for years. He is passionate about cars and detailing. On his blog, he shares his knowledge and experience, offering tips on how to effectively care for your car and extend its life.

Engine sealant is a special preparation whose task is to stop all types of leaks from the drive unit. From this article you will learn how engine cleaning agents work, how to apply them correctly and whether such a treatment makes sense.

If you are looking for more information about engines and operating fluids, please also read the article about changing engine oil.

How does engine sealant work?

One of the hardest-working mechanical components of a vehicle is the drive unit. With its age and degree of use, the risk of various types of leaks increases. They usually find their outlet around the oil pan gasket, front or rear crankshaft seal, or valve cover and head gaskets.

Eventually there will come a point where ignoring the problem no longer helps. washing the engine and its surroundings, or constantly adding oil. A growing problem may lead to more serious breakdowns, which may result in the vehicle being taken out of service and requiring costly repairs. It may turn out to be a good solution engine sealant, which is much cheaper than renovating the unit in a car workshop.

How engine seal? Its target is the rubber seals in the drive unit. It is their condition, and especially its lack, that most often causes leaks. With age, rubber hardens, changes its structure, and thus free spaces are created through which operating fluids can freely escape from the system. Engine sealant softens the rubber and causes it to swell. Thanks to this, it adheres to metal elements again and retains oil or coolant.

Is it worth sealing the engine?

Any type of leakage of operating fluids may be the beginning of serious problems with the drive unit and adjacent systems. Disturbing signals include not only extensive stains appearing under the vehicle, but also clouds of white or blue smoke, which stretch behind the car. Oil or coolant leaking from the engine may cause it to seize or flood the wiring and other electronic and mechanical components..

Removing the effects of extensive failures resulting from uncontrolled leakage of all types of fluids may be much more expensive than preventive sealing.. Many drivers with this type of problems turn directly to professionals. However, such a visit can sometimes amount to thousands of zlotys. A much cheaper alternative is to use oil sealants. But is this the best solution?

Can engine sealant stop an oil leak?

Good preparations are able to solve the problem of uncontrolled leakage if its cause is only the poor condition of rubber elements. Additionally, many preparations available on the market have a protective effect on the engine. For example, some engine sealants they reduce the friction of moving elements and reduce the susceptibility of the oil itself to charring. Thanks to this, it is not burned, which can be seen by the quantity and quality of exhaust gases. Such a procedure can therefore not only extend the life of the engine, but also diesel particulate filter, which is an element of the exhaust system.

However, it is important to mention that not all leakage problems can be solved by using a sealant. Mechanics point out that sometimes this may even have the opposite effect to that intended. Some preparations may cause clogging of oil channels, which may even result in seizure of the drive unit.

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What should you consider when choosing an engine sealant?

Before you start cleaning up oil spills, you need to choose the right one engine sealing preparation. Diesel and gasoline are fuels with different requirements, but many agents currently available on the market can be successfully used regardless of the type of engine unit. However, before purchasing, read the label carefully to make sure that you are dealing with such a preparation. The sealant is added to engine oil, so you should check what type of oil the product is compatible with.

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How to use engine sealant correctly?

Before you start using it oil sealant, the leak site must be precisely located and its cause determined. The intensity at which the oil escapes is also important information. To obtain it, place a cardboard box under the vehicle and leave it for a few hours. If the accumulated stain is large, it may mean that the leak is caused by a broken seal, and then the preparation will not be of much use.

Then wash the area around the leak thoroughly. Many people also decide to completely change the oil to extend the life of the sealant. However, this step is not mandatory. The next step is to add the agent sealing. It should be poured in the place where the engine oil filler neck is located. Then we need to start the car so that the oil and the preparation mix thoroughly and spread throughout the entire system.

To assess whether the product has solved the problem, you should drive the car normally for some time. If the fault still persists, this means that home diagnostics and repair did not bring the expected results. This is a good time to contact a mechanic and seek professional help.