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Message: [QUOTE="NCSU dirt man, post: 1369367, member: 7428"] Thanks everybody for the input Well that being said what is the safe oil change interval with a synthetic then? I mean we participate in CAT's SOS program on all of our tractors, dozers, excavators, graders and pans. But truthfully we've never even considered it with just our basic 3/4 and 1 ton fleet trucks or on the Peterbilt and Macs we run as our lowboy and dump trucks. I have always changed my own truck's oil at about 4500-5500 miles period. How much longer am I looking to go with a synthetic oil between changes? I have read a lot of people claiming these 6.7's have blow-by but then again my truck rarely idles much either as I am usually commuting from office to site or home. Not a big fan of idling period [/QUOTE]

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