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Put over 250,000 on a 2002 ford 7.3. Rotella, changed every 3000 miles or 90 days, whichever came first. Firmly believe clean oil and filters key to diesel long life. Despite Ford specs, I change my own oil on my diesels much sooner than Ford recommends.
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Mike and Lorraine
2002 3655 FL, 2005 3650RK
2010 3665RE, 2015 3910FB
F350 crew cab dually 6.7
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