I know that the manual says 10 psi at idle, but I get anywhere from 8-10 at idle while using 5w30 with some oil additive, so it is really 10w40, and it is the winter! When I first start the car it is around 80-90 then when it first gets to idle car still warming up but at 750 rpms it is around 25 then drops. What is this?

 

Has anyone had this problem. Is it bearings or is it just because the engine is wearing down. It has 172,000 miles.

 

If you are asking why the oil pressure is higher when it's cold in winter, it's due to the oil being thicker. Once it warms up it will thin and give you the lower oil pressure. Seems normal to me though maybe I'm missing something.