I am sure this is a noob question, but none of my other diesels have done it and none of my co-workers seam to do it. When it is cool outside, truck starts just fine but as soon as I drive off it seems my oil presure is almost pegged, I normally let it warm a little befor I leave. The presure still does not come down untill it is almost compleatly up to temp. I try to baby it untill the presure comes down. Do I need to?