Probable worn hydraulic cam followers/lifters . They have a specific leak down time and if badly worn then the pump may not keep up the pressure at idle. Alsao there may be a problem with the pressure relief valve in the oil pump system
SOURCE: I have a 1990 camry. Starts good, idles OK, can
check your IAC valve, it may be sticking/stuck. hopefully this helps
SOURCE: oil light on no pressure gauge sounds like now
ur diesel engine is ur rockers and push rods /valves and lifters metal on metal no oil lubing parts--real bad --sounds like an oil pump problem if level is good-- would require to have scanned for trouble code it would narrow down trouble but driving will most likely cause more engine damage need to have mech or dealer inspect and scan problem and its advised to have it towed where ever u pick
SOURCE: I have recently purchased a 1997 Toyota
Unless you are in a cold part of the country, I'd suggest 10W40 or even 20W50 and see if the oil pressure improves. Mobil 1 will often yield lower oil pressure in higher mileage engines when hot. It's really not worth the money unless you live in near arctic conditions.
SOURCE: Low oil pressure at idle, up tp 20psi under
You could have a blocked or broken oil pickup inside the sump or a broken spring in relief valve Think relief valve is on pump on those but not sure I'd be looking hard at pickup in sump
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