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2015 Ford F350 Super Duty Platinum. I have always been a fan of synthetics as I had a good friend who ran the fuel testing lab at Southwest Research here in San Antonio for over thirty years and he has told me that the Royal Purple products surpassed everything else he tested. I changed all my differential, transfer case and transmission fluids to theirs at 60K and will probably be dead before they have to be changed again. Use their oil as well. I also do not trust the truck computer regarding oil changes. At 5K complete change and 10K filter change and top off. Just my $.02.
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