Need to determine cause of oil pressure reading drop in guage AFTER truck warms up. Oil pressure reading seems normal when starting vehicle when cold. Oil pump responds to acceleration, but amount of oil pressure according to guage drops after warm up. Using 10W - 40 oil, in cold climate, as recommended. There may be less quality in oil; I don't know, I bought it at Wal-Mart (for high mileage engines). Oil and filter recently changed. Is it possible for this to result from poor oil quality or wrong filter?
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Can a clogged or broken muffler affect the oil pressure reading?
Your oil pressure drops simply because it thins out as it gets warmer. No muffler should have no affect on oil pressure.
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