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First how do you know your oil pressure is low? Low oil pressure would not keep the oil from getting to the top of an engine by itself. The oil pressure valve you speak of would be in the oil pump,but the pressure relief valve being stuck openn would not cause this eather. The only thing that will raise oil pressure is to put new main bearings in that is where the pressure comes from.

I had the same problem with my 3000GT. Took it to the dealer and first thing he asked me if I was using an aftermarket filter (i.e., FRAM). He replaced it with a genuine Mitsubishi filter and the car runs just fine now! I use the OEM filters only now and have had no problems for over 100,000 miles since. Mechanic told me that the Mitsubishi filter is specially designed just for Mitsubishi cars, to assure oil gets to the top of the engine. Aftermarket filters are too "universal" and now I am a believer!

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Q: 2002 Montero is not getting enough oil pressure to the top of the engine. It is making clank noise on top but no knocking Any ideas Do you know where the oil valve isso you can see if it is stuck open?
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