In Reply to: Oil flow mystery posted by COLVIN on October 09, 2020 at 07:47:19:
The oil filter canister has a brass NPT drain plug on the bottom. Try using that next time. Get engine HOT, not warm. Place drain pan under oil pan plug and under canister housing. Remove drain plugs and walk away for good half hour at least, longer if possible. Filter has small handle on top, or should. Pull and twist easy so you don't break it. Can flush canister with mineral spirits then replace plug. Clean old gasket from drain plug and mating surface. Replace with new gasket -wipe with clean oil first and tighten plug. Refill with about 3 quarts of clean oil. Start engine and check for leaks. If OK top off using dipstick gauge sight. Capacity is 6 qts but just put 4 or 5 in it for now and sneak up on it by verifying the next day. Oil gauge should read about 27 PSI at idle when warm. Older worn engines will slowly decrease PSI when running hot. Gauge should not peg at 50 under full throttle. Try removing oil line at gauge and blow compressed air thru it and try again. If same, try new gauge and maybe having oil pump rebuilt.