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I always ran the Rotella T6 full synthetic in my 08 Duramax, 12 Powerstroke 6.7, and now have the Valvoline Premium Blue Extreme full synthetic in my 17 Powerstroke 6.7, as initially Ford had not approved the Rotella T6, but now it is approved. I have enough of the Valvoline left for my next oil change or 2, so I will have to decide which of the 2 I stick with after that. Either way, I’ve always gone full synthetic.
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