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21A-210H031 blowing oil out of exhaust

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Oil coming out of the exhaust on 4-stroke engines (cars and trucks) is usually bad rings on the pistons. Or a complete engine tear down at the very least.

Posted on Apr 19, 2014

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Why is my 2000 kia sephia blowing blue smoke from the tailpipe. it has 86,000 miles. the check oil warning light is on even though the dipstick reads full.


The most common cause of blue exhaust smoke is oil leaking past engine seals and into the cylinders where it then mixes and burns with the fuel. This is most frequently seen in older or high mileage cars with worn seals and gaskets. It only requires a very small amount of oil leaking into the cylinders to cause excessive blue exhaust smoke.

Blue exhaust smoke only at start-up can indicate worn piston seals or damaged or worn valve guides which may also cause a rattling noise. An external engine oil leak can drip onto hot engine and exhaust parts causing what appears to be blue exhaust smoke. Other possible causes of blue exhaust smoke include: piston wear, worn valve seals, a dirty or non-functioning PCV valve, worn piston rings, an intake manifold gasket leak, worn engine oil seals and possibly even head gasket failure.

Oil leaking into the cylinders can cause a rough idle, misfire and fouled spark plugs. In addition, a reduction in power and oil loss can be indicators that the blue exhaust smoke is caused by an internal engine oil leak. Internal engine oil leaks can also allow fuel to mix with the oil in the crankcase which will degrade the oil and prevent it from adequately protecting the engine.

Operating a car with a severely dirty oil filter, air filter or improperly functioning PCV valve can also sometimes result in engine oil blow-by, oil loss and blue exhaust smoke. Periodically checking the engine oil level with the oil dip stick will indicate if there is excessive oil consumption. Higher viscosity engine oil can sometimes temporarily reduce the amount of blow-by; however, this is not generally recommended. Excessive blue exhaust smoke indicates a possible internal engine oil leak that should be inspected by an ASE certified mechanic.

Dec 08, 2014 | 2000 Kia Sephia

1 Answer

Camry csi 2000 oil leak between engine and transmission


Lots of Camrys do this.

The oil will typically leak from the rear main bearing seal between engine and transmission, but that will appear at the bottom of the joint line, and will not reach the exhaust. This leak is expensive to fix and is usually left as is.

A leak from the cam cover gasket can drip into the exhaust.

The other typical leak is from the distributor shaft o-ring seal. This appears at the top of the join line between engine and trans, and can blow back onto the exhaust.

Jan 03, 2014 | Toyota Cars & Trucks

1 Answer

My 2004 sunfire is burning oil and blowing black smoke from the exhaust what could this be and is there an easy fix?


With that many miles the rings and valve guides could be failing.
Could also be a venting problem with the crankcase. ( PCV )

Jul 04, 2012 | 2004 Pontiac Sunfire

1 Answer

When you push down the acceleration it dies out. Now it wont turn on , when it is turned on , it hesitates to stay on...We thought it was the fuel pump at first cause it wont start at all , but weve...


Well if you feel there is exhaust being blocked then maybe the catalytic converter is plugged.
Where is the oil blowing out at? Exhaust??? A breather?
If you have oil coming out the exhaust then that could have baked in the cat and plugged it. But that would be the least of your problems as there should not be oil getting in there.
Out a breather or even a seal then it could be a bad PCV. But it still should not blow out much.

Aug 31, 2011 | 1997 Mitsubishi Diamante

1 Answer

My 97 civic lx is leaking oil from the exhaust. I recently had the timing belt and distributor replaced but it continues to build up an oil mist on the rear bumper. The gas mileage has dropped...


I would pull the spark plugs and see if they have oil on them. If so, I would have to say that you have BLOW-BY. In other words the piston rings on your pistons or the cylinder walls are worn. When this happens oil can blow-by the piston rings into the combustion chamber. So as the exhaust opens up the oil is flowing through it and into your exhaust. This can be a very expense repair.

Jul 26, 2011 | 1997 Honda Civic

3 Answers

Raw oil in exhaust, NOT burning it, oil useage about 1 qt every 500 miles, Just tuned up including PCV, Engine starts well, runs well for a time then starts to bog down. restarts after it' been sitting a...


having the same problem with a toyota I am currently working on. Possiable ring problem check spark plugs and see if you have oil on any of the plugs

Oct 13, 2009 | 1999 Kia Sportage

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