Low Oil Pressure At Idle

[gabedrummin]

First thing I did when the indicator light blinked at me was drop the pan.I thought the pick up was clogged . No clog or debris found. I added a 2 quart sump and changed from 0-w40 to 5w-40 . Maybe the thicker oil is hard to pick up at low RPM ?I ordered the spring and piston, a new sending unit for a 996 ,and a separate oil pressure gauge .I will put the bypass and gauge in soon .It would take little wear to lose oil pressure between the oil pump gears and walls of the pump at idle.I wonder why you cant get the gears.My 72 AMC jeep's 401 V8 had the oil pump in the timing chain cover .And a rebuild kit was available.

[911monty]

Have you checked vacuum at the oil cap. This could be caused by a failing AOS. According to Dr. Raby there are two failure modes for the AOS. It can fail in a condition that pulls oil from the oil pump pickup, sometimes accompanied by a high pitch squeal from main seal(s). Since max vacuum occurs at idle it's a possibility.

See discussion attached Looks like AOS, but engine WOES

[gabedrummin]

Cap can be removed easily ,when removed car runs bad .Put cap back runs ok again.