When I open the engine oil cap, what is supposed to happen?
#1
When I open the engine oil cap, what is supposed to happen?
So, when I open the engine oil cap while the car is running I get this pvvvvfff noise, the motor doesn't change as far as hesitation or anything, just feels like air coming out. Is that normal?
#2
Air should go in as crankcase is maintained below atmospheric to insure crankcase gas is recycled through the PCV and into the engine. No harm in removing oil filler cap w/ engine running but you may see a little outgasing due to loss of vacuum.
good luck
good luck
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