Help!!! Very low oil pressure on '02 E66/745Li I reach out for help to those of you most knowledgeable about the N62 engines. Several weeks ago I began having a low oil pressure problem -- measured at the oil pressure switch bore on the passenger side of the engine. Since then I removed the oil pressure switch and replaced it with an analog gauge, which confirms a pressure of up to ~10 psi when the engine is cold, dropping to 1-2 psi when nearing normal operating temperature. I am running the standard full synthetic 5W-30 that the dealerships, shops, and many articles approve for these engines at all ages. Going back and forth between my father and I (side note: this is my car, not his), we decided to replace the oil pump -- which on this engine also contains check valve / pressure relief valve and filter assembly. My heart began to sink when I pulled the old pump apart and didn't see any sign of wear or a single thing out of place; it was pristine. This past Sunday I got the car all back together, new oil [again] and all, just to find that the problem is still there. Nothing at all has changed. My questions to you who are reading this: are there any common causes of this issue on these engines? How would you go about finding the location of the pressure leak if this was your car? Am I looking at a blockage (note: all oil filters have been extremely clean)? A backed-out bolt in the valvetrain somewhere? Cracked block? Blown head gasket? Bearings? Thanks in advance!