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I've been running Castrol Agri-Power Plus 15w40 in the Cummins 4BT's and the Multifuels for years. Meets the same slew of Cummins/Mack/Cat/Milspec/API ratings as the Rotella and others mentioned in this thread. Not only has it been a dollar a gallon less expensive at Agri-Supply, but it is...