Yes, cold oil will make higher pressure. Much higher... but it simply gets dumped across the relief valve in the pump body. The net result is that the rest of the engine is starving for oil. The pressure sensor being somewhat higher up than the relief valve will see a lower pressure, and it is right, as are the rapping lifters. You did the right thing by dropping the oil. I guess if it's desparate cold then mabey 5W20 is in order, but I probably would have went with 5W30 minus the Lucas. While I suppose it's good as a viscosity improver in an old worn engine, if yours is still in good shape and tight, all it's doing is starving the engine for oil because cold thick oil can't flow.
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Today's Featured Article - Talk of the Town: How to Remove a Broken Bolt - by Staff. Another neat discussion from the Tractor Talk Discussion Forum. The discussion started out with the following post: "I have an aluminum steering gear housing with a bolt broken off in it. The bolt is about a 3/8" x 1 1/2" bolt. I've already drilled the center of the bolt out with about 7/64" drill bit the entire length of the bolt. Only one end of the bolt is visible. I tried to use an easy out but it wasn't budging and I didn't want t
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