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Hi I'm looking a recommendation on a diesel oil preferably synthetic. This is for a new to me 1999 Case 580sl with a cummins turbo diesel 3620 hours on the clock. The manual states cg-4,cf-4 in a 15w-40 weight. Mobil 1 Turbo Diesel Truck 5W-40--- is cg-4 but not 15w-40 or certified for...