Quote:
Originally Posted by mechman600
Not according to bobistheoilguy.com
For 2013 Cummins is saying that 5W30 is ok in heavy duty truck engines. I think they are coming factory filled with 10W40 instead of the usual 15W40. However, talk to anyone at a Cummins dealer and they will tell you that 5W30 is wonderful until you find your engine worn out in 2/3 the time as normal.
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never said that you should run 5W-30 in a diesel, only that most people seem to have no idea how the xW portion of a multi-grade oil is determined. i too am an active BITOG'er and would like for everybody to get the best of what their money is paying for. 10 and 15W oils are old-school thinking, there's no reason any engine running a 30, 40 or 50 weight oil can't run 0W-30/40/50, or at least 5W-30/40/50.