The folks who maintain their membership in the Flat Earth Society will tell you there's a problem with Multi Weight oils, detergent oils, ect, but have no solid evidence to back up their stories. They're just stuck in the stone ages. Old tractor manuals suggest straight weight oils because that was what was available "back in the day".
Over the road semis use 15/40 (of various brands) with tremendous success. They pile up hours/miles that most tractors never see. I've used Pennzoil 15/40 in my diesels (trucks and tractors) for as long as I can remember, with NO issues. That includes a couple older tractors with (in excess of) 15,000hrs (on original motor)
The earth is round, the moon is NOT made of green cheese, and 15/40 diesel rated multi-weight oil is the best thing for diesel engines, new OR old.
Rotella is as good as most. I use the Pennzoil because a friend is a Pennzoil distributor and I get it at a good price. My bro-in-law uses Napa 15/40 without a single problem and has for years.
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Today's Featured Article - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
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