Compression Check low oil pressure Now What?

If you go the high volume oil pump route, you will need the MP hardened oil pump drive shaft or it is possible the stock one will twist and break under the extra load. If the car was neglected and the oil not changed frequently enough, my money is on a partially clogged oil pump pickup. Sludge can collect on the pickup screen over time and stop it up. Contrary to some popular belief, oil pressure comes from one place and one place only. The oil pump. Main, rod and camshaft bearings do have some impact on the oil pressure, but without the oil pump getting a proper flow of oil from the pickup, the flow to the rest of the engine will be low. If it was mine, I would find a good brand motor oil flush for the crankcase, follow the directions and see what happens. You might not even have to remove the oil pan.