I would highly suspect you have a blown head gasket. The white smoke is coolant entering the combustion chamber. The oily back window is from the coolant smoke. If you are loosing coolant with no apparent leak, you have a milky substance on the underside of the oil fill cap, you see air bubbles escaping from the radiator with the cap off, or you oil level is slightly above full, these are all symptoms of a blown head gasket. STOP driving the car immediately until you verify what the problem is. Driving it with a blown head gasket will do serious damage to the engine.
Head gasket gone ,no oil loss?? the water is going in the oil
White smoke: White smoke is caused by water and or antifreeze entering the cylinder, and the engine trying to burn it with the fuel. If white smoke is present, check to see if the proper amount of antifreeze is inside the radiator and the overflow bottle. Also check to see if antifreeze has contaminated the engine oil. You can look at the engine oil dipstick, or look at the under side of the engine oil filler cap. If the oil is contaminated with antifreeze, it will have the appearance of a chocolate milkshake. Do not start the engine if the oil is contaminated with antifreeze, as serious internal engine damage can result.
It is also possible to be a engine problem you should immediate visit a car service.
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most likely it is coolant not oil, smell it, does it smell "sicky sweet"?
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