I am about to take advantage of the up coming long week end and replace the lower shell of my main bearings in an 84 533i. I am running 2 or 3 PSI at idle to 10 to 14 PSI at 1500 to 2000 RPM (at operating temp) with
Mobil 1 15w-50. Overall the car runs well with 189,000 miles. I also have a oil pump I will put in at the same time.
Any tips before I dive in? I have checked all of the other simple places to look for pressure problems, with no luck.