If your engine is burning oil there is a good chance it won't pass a smog test. You should get it to a mechanic immediately as it's not only a danger to the environment, but possibly could be a danger to you.
smog
Oil burning is usually connected to engine wear. Valve seals and piston rings wear out and allow oil to pass into the cylinder during combustion.
engine burning oil
The brand and weight of oil you use has no effect whatsoever on passing a smog test. Use the exact weight of oil that is recommended by BMW.
You either have an oil leak or the engine is burning oil cause by worn piston rings. If you see blue smoke it is burning oil.
your car has oil burning in the combustion chamber of your engine , need to rectify the engine block and replace piston rings
Oil leak or the engine is burning oil.
You can tell this before an oil change. If you see blue smoke coming out the exhaust your engine is burning oil. If you're oil level is low and you have no oil leak your burning oil.
The engine is burning oil
could be a gasket that has finally gaveway and the smell of oil is the oil burning on the engine.
2001 ford winstar sport burning engine oil
burning oil is caused by worn and broken valve seals,or worn or broken oil rings on the pistons