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RE: Who runs Shell ROtella 15w40 in 3rd gen diesels?
I run the Rotella 15W-40 in my '07 5.9L. I just use the regular oil instead of the synthetic. I change the oil and filtermyself in mine every 3,000 miles. I always used Shell Rotella in the International Dumptruck I drove everyday for my Town Highway Department when I worked there. Never had no engines problems related to the oil.