I have a B6000 and I noticed that the oil switch light would remain off right after start up, but once the engine was warm it would come on and remain on even at high engine rpm. Owners manual says the switch closes at 7psi. I removed the switch and installed a 15psi pressure gage. When the engine is cold and at idle, oil pressure is about 5psi. Hi speed is between 7-8psi. After warm up the oil pressure is about 1-2psi at idle and 3.5-4psi at high speed. Owners manual says to check bearing clearance for low oil pressure. Not sure I'm ready to tear into the engine to replace all of the bushings in the oil path. Is this typical increased clearances do to bushing wear, or a problem with pump? If I continue to operate at this condition will I damage something? Thanks for you help.