I was wondering if my 1999 dodge dakota sport 4x4 5.2L has a oil pressure relieve valve? If so, where is it located? I am having problems with my oil pressure. I have good oil pressure when the truck is first started but once it warms up and you get on it, it loses oil pressure. I replaced the oil pump and oil pressure sending unit too. I know it cant be bad bearings because i wouldnt have such good oil pressure when i first start it. Even when the gauge shows zero, if i turn it off, then start it up right away it gains oil pressure again. Huh?