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Mobil 1 Turbo Diesel Truck 5W-40 would be a good oil or Shell Rotella T Synthetic 5W-40 heavy-duty motor oil. These oils have a higher detergent but lower amount of friction modifiers, as compared to conventional motor oils. In short, you get a "cleaner", "better" oil than using motorcycle specific oil, but you dont get the potentially slip causing friction modifiers.
Also, if an oil "causes problems" with your engine there is something else wrong. (with the exception of maybe using a 0w20 in the Arizona heat, lol)
I am always open to new information.
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