Why’d my oil cap blow off my 2005 Nissan Altima?

nissan
altima

#1

What cause the oil cap to blow off I put it back drove less two miles and it came oil again


#2

That would seem to indicate an abnormally high level of pressure in the crankcase, and that is not a good thing.
First, check the PCV valve and replace it if it you can’t hear it rattle when you shake it. If that doesn’t remedy the situation, then I would speculate that you have a breached head gasket.

Have you checked the coolant for evidence of oil contamination?
Have you checked the oil for evidence of coolant contamination?