could be anything. if it's not engine oil, or some kind of engine treatment designed to add to your oil , it's more then likely a form of contamination.
too much fuel, excessive oil consumption
Excessive engine RPM....low oil level.....engine component wear/stess/fatigue ....over heating....
Excessive wear, or lack of oil. Or both. Generally lack of oil is what causes the excessive wear.
Excessive oil use, excessive water use, major oil leak, excessive smoking, ask a certified mechanic
engine burning oil
Adding too much oil will cause your engine to burn off the excessive oil which causes a lot of carbon buildup in your engine and a lot of blue smoke out your tailpipe. If the oil level is high enough, it can contact the crankshaft and foam up. If the oil foams it can damage the engine.
The injection system has a tiny air leak that causes the system to not work correctly until the air is purged from the injectors. Look for a tiny fuel leak near and injector or an increase in engine oil level that will show fuel contamination in the oil
Defective oil pressure sending unit? Try installing a manual gauge to check oil pressure Could be excessive engine wear due to mileage Weak oil pump
Knocking noise in the engine may be as a result of excessive backlash, misaligned gears and worn timing chain. Blowing of excessive oil pressure could be as a result of stuck regulator.
Loss of oil due to a leak, loss of nitrogen gas, or contamination of the oil inside the shock.
your intake manifold gasket is cracked...replace it and you should be fine...if it continues you may have a bigger problem
Engine sensors will only "go bad" from environmental effects. Lack of oil causes excessive heat. Heat can cause cam sensor failure