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deuce_roadster · 07-18-2019, 08:45 AM

If you have a turbo (My F150 3.5 Ecoboost has 2) it is better and recommended to run the synthetic as it doesn't "coke" on the shafts like non synthetic oils will due to the heat involved. I don't run synthetic in my flatheads as they seem to mark their territory enough as it is and I don't want to chance worsening that.

07-18-2019, 08:45 AM	#17
deuce_roadster Senior Member Join Date: Oct 2011 Location: Shelton, WA Posts: 3,799	Re: Mixing synthetic and regular oil If you have a turbo (My F150 3.5 Ecoboost has 2) it is better and recommended to run the synthetic as it doesn't "coke" on the shafts like non synthetic oils will due to the heat involved. I don't run synthetic in my flatheads as they seem to mark their territory enough as it is and I don't want to chance worsening that.