Motor Oil Consumption / Blue Smoke From Exhaust

Motor Oil Consumption Stuck PCV valve causing Blue Smoke From Exhaust Leaking Valve Stem Seal causing Blue Smoke From Exhaust Worn Engine causing Blue Smoke From Exhaust Blown Turbo causing Blue Smoke From Exhaust

Image above shows several reasons as to why you get Blue Smoke from your Exhaust. Click on a link in the image to be taken to an explanation for some of the common causes.

Why you see Blue Smoke From the Exhaust

If you are seeing Blue Smoke From Your Exhaust this means that your car is burning oil. It really does not smell very good and is not good for your health to breath in. This smoke should not be confused with White Smoke you will see when a car first starts up. That White Smoke is just water vapor(Steam) that has collected while the car was parked and will go away as the car warms up. Below are listed some of the reasons for the Blue Smoke.

Burning Oil Causes Blue Smoke From Exhaust
©Sandor Jackal/Dollar Photo Club

1 - Valve Seals Gone Bad

If Blue Smoke from the Exhaust appears after you car has been parked for a night or day this would suggest Bad Valve Seals. Oil has probably dripped into the engine while it was parked. Engines have valves that open and close. The Valves are opened mechanically by pressure being applied to them by a Rocker Arm. They let Gasoline and Air into the Engine. They let Exhaust Gases out of the engine after the Gasoline and Air have been burnt.

The top of the Valves where the pressure is applied are covered in Oil. There are Valve Seals to stop this Oil from coming into the engine. When these Valve Seals wear out, they let the Oil into the engine. Oil going into the engine is then burnt along with the Gasoline and Air creating the Blue Smoke.
Valve Seal Leak Causes Blue Smoke From Exhaust
©SNEHIT/Dollar Photo Club

Fix Valve Seals

Valve Seals are not too hard to replace and can be done at home by someone who comfortable working on engines. Big concern with replacing Valve Seals is to not drop the Valve into the Engine. Some people will use Compressed Air put in via the Spark Plug Opening to keep the Valve Up.

Difficulty of replacing the Valve Seals will depend on if the Engine has an Overhead Cam or not. Overhead Cam will require more work as it will have to be removed to access the Valve Stem.

Objective is to remove the Rocker Arm and spring from the Valve. Then lift the old Valve Stem Seal up the Valve Stem and Replace with the new.
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