Last week i collapsed an oil filter the oil dropped to 20 -30 lbs 15psi @ 1200 & 30 @ 3,000 . I changed the filter and all was good. A week later and its back but the filters ok . I changed the filter, oil pump,-10 line frim miloden pump to pick-up , dropped the pan and cleaned and checked p/u .their was some debrie in the pan but i think its from when i had a valve spring break and chewed up the valve guide . ran a diiferent oil line and oil gauge no change.All the rods look good Any idea's