Engine Smoke From Oil Cap

engine smoking from oil capMy 1989 Chrysler Lebaron is smoking out of where you put in the engine oil and from the oil dipstick. It is also smoking from the exhaust when pressing the gas hard, it has an oil drip, and it did overheat a couple of weeks ago. The oil leak has been getting worse and I’m not sure what’s causing it to smoke from the heads and dipstick for the oil it is a turbo if that matter i just need to know what i should fix ?? PLEASE HELP

Hello there

GULP! What you probably have going on is “blow by”. Blow by is caused by compression escaping around the piston ring and entering an area of the engine it is not supposed to be in. This compression has to leave the engine somehow, so it vents out through the areas that have the least resistance….like the dipstick tube and the oil filter cap, and the rest goes out the exhaust in the form of smoke.

Sometimes the compression goes back through the air filter and gets the filter wet with engine oil. This compression also puts pressure on internal oil seals and gaskets…thus causing them to leak externally. Repairing external gaskets and seals without solving the internal pressure leak…..well, it does not work.

So, before you run out and spend lots of money and time trying to solve your external oil leak problem, I would invest a small amount in a “compression test” to determine if the engine is worn out on the inside and does have “blow by”.

If it DOES….you might want to think hard (think HARDER) about getting a new vehicle….or spending lots of money overhauling this engine or replacing it.

If it does have blow by and you are not going to get a new car or engine you can:

1. Use the thickest weight engine oil your mechanic feels comfortable with…maybe straight 40weight.

2. Use an oil additive called “Restorer” which is available at more auto parts stores

3. Change your PCV valve – which ventilates the engine

4. Increase the heat range on your spark plugs…to help keep the plugs from becoming oil soaked

5. Be gentle with it – if you do have blow by, the engine is in its last stage of life….be gentle and be prepared to buy another vehicle VERY soon

Please share this with your friends,

Austin Davis

Posted in: Exhaust Smoke

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