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Q: Low oil pressure on 1994 Honda Passport

I just bought a 94 honda passport, and took it to jiffy lube to have oil changed. I'm not sure if it was before or after but the oil pressure runs at nearly 0 at idle and about 35 while driving.. I then proceeded to do what I should have done and changed the oil myself, with some heavier oil (10w40). Since then the oil pressure is about 5 lbs more.
One important note: the oil pressure is nearly perfect before the vehicle warms up. Then once the normal temperature is reached, the oil pressure drops. (which is why I started by using a heavier oil.)
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The oil grade is important your right. Maybe your oil gauge is not working properly or possible oil pump, clogged filter or strainer, or regulator valve problems.
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