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Old 01-11-2018, 10:39 AM   #9
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Join Date: Oct 2014
Location: California Central Coast
Posts: 1,274
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

Last edited by 911monty; 01-11-2018 at 11:27 AM.
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