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[QUOTE="Atsah, post: 142937, member: 186"] I'm really not sure about the temps.. 6.0 and the 6.4 are two different animals.. The benifit of the synthetic 5-40 is that is flows better when it's cold and helps with injector sticktion in the 6.0.. As far as longevity, your guess is as good as mine.. I use Rotella T-5 10W30 semi-syn in the winter, I like it, it's easy to find and it doesn't cost an arm and a leg, $16.00 a gallon at Wal-Mart.. I change out at 4-5K also.. I use Motorcraft 15W40 May-September.. [/QUOTE]
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