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oil light comes on when engine warms up and goes off when i rev ?

oil light comes on and goes off when i rev the engine ....this only happens when normal tempreture is reached in my 02 vectra dti
christopher nevins, September 2011
Starting from the top:
Check oil level?
Is it due an oil and filter change?
Non genuine oil filter used? If not has it collapsed?
Correct grade of oil used?
Worn oil pump?
Worn main bearings?

ChicksFan, September 2011