To start with there is no need or benefit to having your engine run at 60 to 65 PSI oil pressure.High oil pressure is a power robber not a power maker. I wouldn't jump to the conclusion that your engine is on its way out too quickly. First I'd check it for a change in oil viscosity,I'd change the filter and if it still seems low I'd take a look at the oil filter bypass in the block.There should be a spring behind a metal disc that opens to bypass the filter. If that disc is lifting off its seat prematurely its gonna be dumping oil(and oil pressure) Sometimes merely giving that spring a little stretch will do the trick for you but something tells me that spring isnt right anyway if the normal "at speed"oil pressure is 65 but 20 at idle.I've seen oil pumps with shims placed behind the bypass disc in an effort to raise oil pressure above normal,,Have never seen much sense in doing so IF the motor was worth caring for.To my thinking all the elevated pressure was any good for was putting more strain on the rear main seal and inviting it to fail by doing so. BTW normal oil pressure from the engine manual is 25 to 40PSI so yours isnt far from right.
