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Will a 5-40 weight be ok for year around if I am only changing my oil once a year? My mechanic says are you sure you want that? Your truck calls for 15-40?
I run 5/40 syn Rotella and change once a year with no problems.I pull my 5'er to Florida for part of the winter,otherwise live in Wi.My truck has the 7.3 with 70k.
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