My bmw 325i sport is on 90,000 miles and is going through a jack of oil a month it has no smoke through exhaust and no burning smell also i cant find any leaks ?? the car runs perfect but i do have a yellow oil light that comes on when startded but goes straight off

You might have a slight oil leak that's dripping on the exhaust manifold. This will not cause an error code, at least not until your oil leaks out enough to cause an oil pressure issue.

hi
White smoke is burning engine oil.
mostly when Engine oil is changed or topped up
little oil get dropped and when engine heats up. it burns the oil.
but once oil is burnt then no more smoke is there.

unless you have a leak
thanks

Are you losing coolant?

Is there any white smoke? Could be your valve stem seals. But the Toyota Corolla in this year's is known for burning oil. If you are having to add more than 1 quart per month. You may have a problem. Check for the obvious. Milky oil. Idle it to op temp and smell exhaust for burnt oil smell. Hit the gas...see any white smoke? Open your radiator cap after running and smell for exhaust... If all is well then you have a normal running toyota corolla. These cars are champs. They just tend to burn a Lil oil here and there.

Experienced mechanic 10+ years

white were? the exhaust tip, or other spot, long pipe, name spot?
white, is steam or OIL.
oil smells like burnt oil and takes for ever to dispate
steam is water, and smells , sweet due to 50% glycol inside.
and goes away fast.
but all Gas engines make water at all the time running as a by product of combustion and for sure on cold days, some times full time cold
due to climate effects.
does your neighbors car smoke at same time, (look)
bingo , dew point.

all gas engine smoke cold started, (steam)

so first find out what it is,
take the dip stick out of a hot engine. stalled, drip it on the exhaust
see that smoke ,smell it? that is burning oil
now you know what you have, steam or oil. smoke.

Blue smoke out of the exhaust is indicative of either worn piston rings or valve guides. Either of which will require extensive work to fix. Oil is basically slipping past the rings or guides and into the combustion chamber, where it is being burned and expelled as blue smoke out of the exhaust.

Keep an eye on your oil consumption. A newer model BMW like yours should be consuming less than half a quart of oil every 3-5k miles. If it is consuming more than this then it needs to be diagnosed as either the piston rings or valve guides and repaired, typically by a shop for a job this big on a late model BMW.

Common causes of smelling "burning" oil are:

1. a leak in the valve cover gasket. When oil leaks from the valve cover gasket, it will often burn off on the manifold.
2. a blown oil seal causing oil to burn off on the exhaust system
3. check your exhaust for "blue smoke" a sign that the engine is actually burning oil. Just guessing here but a 16 year old Volvo is bound to have quite a few miles on it.

I hope you found this post helpful in diagnosing your problem. Thank you for using Fixya! Greg

Valve seal leaks will cause an engine to smoke on start until the oil burns off. If a head gasket were leaking it would be smoking constantly.

If you need further help, reach me via phone at https://www.6ya.com/expert/james_8f14c50d9c6cdea8

You should get the car into a shop and have a compression test done. For some reason your engine is burning oil and a compression test that will show leakdown can help pinpoint the problem. Hope this helps.

You are smelling burning antifreeze. likely a head gasket but only testing will determine that for sure...Do not drive it. get it to a shop or more damage is likely.