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Ive allways used Shell Rotella 15w 40 in my Diesels... even in the winter until i went to school in the U.P. of Michigan, then i put 5w 30 in for the winter and it was fine, but then i drove to texas over spring break on the thinner oil and it did fine... oil never got too warm, stayed around 190 degrees, ran fine.... but ive gone back to 15w 40 for the summer.... but i would think you would be fine with 10w 40
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