I'd just use the JD 15w40 oil in all of them since you have it. I run 15w40 Rotella in my mower and tractors. Works fine and is easy to find and cheaper than most to buy. I knew of 1 guy that ran royal purple in a Cadillac with the 4.9 engine and had good luck with it and put a ton of miles on it. Think he may of went 10,000 mi at least between oil changes.
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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