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Message: <blockquote data-quote="Stephend" data-source="post: 5085" data-attributes="member: 694"><p>I have a 751 F with 1440 hours, it is a 1999 model. I use Rotella 15w-40 with less than 20 hours on the oil. I change oil every 50 hours. My problem is the oil pressure light comes on when the temperature is below 30 degrees. It will go off if i idle the engine to the lowest setting with the speed level and operate the aux hydraulic switch to lower the eng. rpm even lower. Once the engine is warn the light stays off at all rpms. The oil light does not come on at all once started when temps are 40 or above. The engine does not use any oil between changes. Is my problem the wrong oil weight reange, defective oil pressure switch, oil relief valve stuck open, or What? Thanks</p></blockquote><p></p>