Oil Leaks
IMS seal, look at the oil filter if its wet can be cracked or pinched o ring. Oil drain plug (will leave a oil puddle), Or reseal the oil pan (RTV gets old sometimes)(will leave a oil puddle). The best way to look for leaks is clean the motor with degreaser, and drive it on a dusty road it shows up fast. If you have no oil puddles then it sound like it only leaks under pressure.
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