Yesterday I put in a new oil pressure sensor cause mine was bad. Then I changed the oil I used Valvoline 10w-30 synthetic oil. Now when driving down the road my oil pressure is at the half way marking and when at a stop light the oil pressure drops down to "L" and the oil light comes on. Is this an oil pump or is the motor just tired? It runs very good but it does have 205xxx miles on it.
Oil pressure drops
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What kind of oil filter did you put on? These trucks can be sensitive to that. My case was almost exactly like yours:
I go to a guy who's a race mechanic, and he keeps himself in business by doing "ordinary" stuff on the side. (I can't do my own work any more because I have advanced arthritis.) He had been using an off-the-shelf oil filter from his regular supplier on the truck, and I had this exact problem. When towing the trailer or anything that really warms up the engine, you stop at a stoplight and the pressure would drop way down. WAY down toward "L".
I remembered that I'd never had this trouble when using NAPA Gold (Wix) filters, so this last oil change I asked him to get one. Problem solved! The oil pressure drops just a bit, but not WAY down like it did before.
It's a cheap fix; suggest that you try this right away - I mean like right now, because anytime you get an OIL light, it is serious, serious trouble. Until you get it fixed, shift to Neutral when at a stoplight. The little increase in engine RPM will keep the oil pressure up.
Hope that helps you out.
I go to a guy who's a race mechanic, and he keeps himself in business by doing "ordinary" stuff on the side. (I can't do my own work any more because I have advanced arthritis.) He had been using an off-the-shelf oil filter from his regular supplier on the truck, and I had this exact problem. When towing the trailer or anything that really warms up the engine, you stop at a stoplight and the pressure would drop way down. WAY down toward "L".
I remembered that I'd never had this trouble when using NAPA Gold (Wix) filters, so this last oil change I asked him to get one. Problem solved! The oil pressure drops just a bit, but not WAY down like it did before.
It's a cheap fix; suggest that you try this right away - I mean like right now, because anytime you get an OIL light, it is serious, serious trouble. Until you get it fixed, shift to Neutral when at a stoplight. The little increase in engine RPM will keep the oil pressure up.
Hope that helps you out.
I am running a Fram oil filter. I guess the $80 I just spent on the oil change is better than replacing the motor. I was told to use some of the Lucas oil treatment and see if that works. I bought some but haven't used it yet. What oil did you use?
I wondered that too. The truck sounds completely fine. I drove all winter with a bad oil pressure sensor and always had my truck started for at least 30 minutes every morning to warm up before leaving for work. The truck has never made a bad sound and it runs very strong.
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