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Blue exhaust smoke using oil temperature light on

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Blue smoke means you are burning oil

most likely worn rings but you'll need to do a compression and cylinder leakdown tests

Posted on May 07, 2010


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Whet is my 2007 Toyota Rav4 losing oil out of the tall pipe and how do I fix it.

Leaking exhaust valve guides is my guess, IF it is oil?.

You would also be burning blue smoke of you were losing oil.

Are you sure with is not black sooty condensation water? That is normal at this time of year. Oil in the exhaust would normally be burned off as smoke due to the temperatures in the exhaust manifold and catalytic converter. Let the drips land on kitchen towel, leave it in a warm place and see if it is really oil? I doubt it is.

Dec 11, 2016 | 2007 Toyota RAV4

2 Answers

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

What do i do about blue smoke coming out of exhaust on a 1991 honda civic?

Blue smoke is oil being burned in the cylinders with the gas.

You need to determine:
How bad is it?
Where is it coming from?

It could be anything from not too serious to your engine is on its last legs.

On the "not too serious side" is a chance that it is bad valve seals. If this is the case, your oil consumption will likely not be high and the blue smoke will likely be mostly right when you start the engine.

On the "really bad" side, it could be the piston rings, or a cracked block or head. This would mean the fix is either an overhaull or an engine replacement. On the positive side, this is a relatively easy engine to overhaull and good used engines are readily available. 88-91 1.5L Honda Engines are interchangeable. If it is one of these, you will probably see blue smoke all the time and maybe more when accellerating. Oil consumption will likely be high (you will have to add oil often.)

Start with a compression test. Are all the cylinders about the same or is there a big variation? Do it with the engine warmed up and at normal operating temperature.

When you pull the spark plugs, for the compression test, look at each one. Do they all look about the same or is one or more fouled with oil?
You should see nothing liquid on the "business end" of the plugs and if you see oil, you have a problem..

If one cylinder has low compression, then you may want to charge the cylinder with it set to Top Dead Center (TDC) on the compression cycle with compressed air or nitrogen and listen to where it is leaking.

If it is hissing out the exhaust, it is probably an exhaust valve or seal.
If it is hissing in the block, listen where you put the oil in, then it is probably rings. If it is hissing out the tube that connects to the air filter, it is probably an intake valve or seal.

If all cylinders are low, it is likely worn out piston rings.

Another check that will help identify the problem is to squirt some oil into the spark plug hole of all 4 cylinders and recheck the compression. If it comes up significantly, it is likely rings.

Good luck. Blue smoke in the exhaust is one of the things you should always look for when buying a used car. Another simple thing is look at the air cleaner - if you see any oil in the air cleaner housing - walk away. (it is from what is called "blow-by" and means the engine is worn out). Take a look at the dipstick at see if the oil looks like oil and has no milky or foamy look and does not have a strong burned smell to it. When the engine is running and warmed up, look at the coolant container. Are there air bubbles coming up? Yes means blown head gasket or cracked block. Also look for oil mixed with the coolant (same thing). There are a number of easy checks you can make that can save you from buying someone else's expensive problems. (or at least know what you are getting)

Blue smoke in the exhaust is always a bad thing, but not always a catastrophic thing. If it is a small leak from a valve seal, and gives you a little blue smoke at startup, you may be able to ignore it for many tens of thousands of miles. If you see a lot of blue smoke and all the time, expect the spark plugs to foul out soon, and the car may not even start in cold weather. Also expect to add a lot of oil or else have the engine run out and self destruct. If the oil light comes on (and the temperature starts to go up quickly) the engine bearings are starved for oil and it is about to become a boat anchor.

Jun 02, 2014 | 1991 Honda Civic

2 Answers

What could blue tailpipe smoke be from?

Your issue could be a few things. Simplest first would be the PVC valve. Other issue would be valve seals, valve guides or piton rings. The blue smoke is from your vehicle burning oil

May 19, 2014 | 1988 Toyota Supra

1 Answer

Mazda 6 1.8 ts 05 constant blue white smoke out of exhaust

It probably has some internal engine damage. If you pull the spark plugs one or more will probably be oil fouled.
You may want to have a compression test done and see if you can find the source of the oil - may be a head gasket.

Aug 27, 2012 | 2005 Mazda 6

2 Answers

Blue smoke in the exhaust

Have you checked your oil? If it is low add the oil but blue smoke usally means the motor is using oil could be the rings or broken rings you will have to check the compression in the cyl.

Jan 09, 2012 | Cars & Trucks

3 Answers

Hello, I have a 2001 ford mustang gt. At times when I first start it up some white smoke is coming out of both exhaust pipes. I took it to my mechanic and he said it it probably oil getting in the...

white smoke is coolant leaking into the combustion chamber

blue-ish smoke is oil in the combustion chamber

black smoke is excessive fuel (running rich)

If it is white smoke, pull the oil dipstick and check to make sure your not getting coolant in your oil.
If thats okay check the compression on each cylinder to make sure your head gasket isn't leaking.

if your car is burning oil, you may need to replace your PCV valve(about $5).
As far as oil additives, try RESTORE

Sep 25, 2010 | 2001 Ford Mustang

1 Answer

Reset check engin light

White smoke from exhaust indicates burning coolant. Blue smoke from the exhaust indicates burning oil. In replacing the valve cover gasket for an oil leak, some smoke from residual oil is normal but it would be excess oil burning off on the manifold from the engine compartment, not the exhaust. Hope this helps with your question.

May 14, 2009 | 1999 Volkswagen Passat

5 Answers

Blue smoke coming from exhaust

blue smoke out of 1.8 turbo its allways bad oil seal inside turbo.need new turbo or rebuild OEM. with 24 years experience working with vw never seen single headhasket go bad on 1.8 turbo smoke its 100% turbo every time

Jul 17, 2008 | 1999 Volkswagen Passat

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