Why does blue smoke come out of the exhaust? - The Truth About Cars - Navara

Why does blue smoke come out of the exhaust?

Why does blue smoke come out the exhaust? What is the cause of blue smoke? Blue smoke from exhaust means that the engine is burning oil. Now, why is the engine is burning oil? That is the problem that we need to know.

 

Usually when an engine burns oil it means that the engine has a bad ring, but aside from blue smoke if the engine has bad ring there is also a power loss and this can be notice especially when the car is being driven uphill.

Possible cause of blue smoke:
(1) Bad ring
(2) Valve stem seal are bad
(3) Turbo charger is seals is leaking

How to determine what cause blue smoke to come out of the exhaust
(1) If the car losses power while going uphill then bad ring is the one that causes blue smoke.

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(2) If the blue smoke is only noticeable when the car accelerates then the cause of blue smoke is a bad valve stem seals.
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(3) If the car have turbo charger then the cause of the blue smoke is the leaking turbo charger seals.

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What to do?
(1) Bad rings
Bring the car to the repair shop, asks the mechanic to check the ring by subjecting the engine to “wet compression test” to confirm the ring is bad. It will cost a lot if the engine has bad ring.

(2) Bad valve stem seals
Same when having bad rings, replacement of bad valve stem seals also cost a lot. Bring the car to the repair shop and have it replaced, if the problem still occurs a complete valve job is necessary.

(3) Leaking turbo charger seals
Bring the car to the repair shop and asks the mechanic to check the turbo charger seals for any leak. If the problem is confirm to have a leaking seals, repair to fix the problem.

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