Originally Posted by
Stewi
Ok just dug up all in info in the service manual
it says 4.2psi is the minimum service limit with the engine warmed up at idle (figure 600-800rpms give or take) and 43psi is the mininum at 3500RPMs. I would have your mechanic test the pressure with the engine at 3500RPMs and if its below 43psi, I would be looking for a new engine. If its still low, it could be the pump, but it could also be damaged bearing inside the engine thats allowing too much oil pressure to pass by, which creates less overall pressure in the system. This happens typically when you damage a crank or balance shaft bearing it creates a giant oil "leak" inside the engine which causes the pressure to drop drastically.