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 - Ford Part Number Trivia - by Forum Participants. "Replaced by" means the part was superseded. All of my part books date back to 1964 and New Holland have changed some part numbers. They usually put the old Ford part number on the package. I was suppressed when I looked up the part number of the auxiliary drive shaft because for some reason the part number went through a radical change and it lost its "Basic Part Number". Ford part numbers follow the following rules. Most part numbers are in three parts. The middle part is called the
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