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 - Show Coverage: Journey to Ankeny - by Cindy Ladage. We left Illinois on the first day of July and headed north and west for Ankeny, Iowa. Minus two kids, we traveled light with only the youngest in tow. As long as a pool was at the end of our destination she was easy to please unlike the other two who have a multitude of requirements to travel with mom and dad. Amana Colonies served as a respite where we ate a family style lunch that sustained us with more food than could reasonably fit into our ample physiques. The show at Ankeny
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