I always run 15-40 in my Ford 7.3 Powerstroke. It has pretty high oil pressure, especially for having 300,000 miles on it. It leaks a little out of the rear main seal, but what can I expect? I switched Las winter to I think was either 5 or 10-40 diesel oil, but it sure sped my leak up, so I went back to the 15-40. Works great usually except when it's very cold. Forgot to plug it in a few weeks ago when it got down to -16F. Started right up but the oil was so cold and so thick it blew the o-rings on the oil cooler, so it was leaking oil all over, glad I saw the puddle under it before I left. The old, hard o-rings probably didn't help, but the thick oil didn't do it any favors either. The coolant heat goes through the oil cooler on a 7.3 so it will at least warm up the oil in the oil cooler and the oil in the injector galleys in the head are warmed by the coolant in the head. Helps anyways
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Today's Featured Article - Tractor Profile: Farmall M - by Staff. H so that mountable implements were interchaneable. The Farmall M was most popular with large-acreage row-crop farmers. It was powered by either a high-compression gas engine or a distillate version with lower compression. Options included the Lift-All hydraulic system, a belt pulley, PTO, rubber tires, starter, lights and a swinging drawbar. It could be ordered in the high-crop, wide-front or tricycle configurations. The high-crop version was called a Model MV.
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