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I took a look at the specifications for Shell Rotella T 15/40. The current diesel oil spec is "Cl-4". Look for this and "SJ"on any oil you use in a diesel. Shell 15/40 is rated "Cl-4Plus, Cl-4, CH-4, CG-4, CF-4, CF/SJ, SL. It lists heavy truck mfg. requirements met, farm equipment mfg...

Interesting information about the oil. Thank you Bjorn for taking the time to present the information that is hard to find anywhere else. Multi grade oils have changed a lot in recent years. Interesting also that the engine in my son's M35A2, my M543A2 wrecker miltifuel engine, my dump truck...