We have a 2017 2.3 EB Explorer. The Ford oil spec is WSS-M2C-946-A. As far as I can tell the only properties needed to meet this is the oil have the API Star, The API Donut with API SN service, 5W-30 wt, energy conserving and also meet ILSAC GF-5. This encompasses just about every major brand 5W-30 oil whether conventional, synthetic blend or synthetic. It appears that synthetic 0W-30 oils meeting the above specs also meet the Ford specs. With the EcoBoost engines being DI and Turbo and "being able to go 10,000 miles" OCI's via their OLM's what makes this Ford oil spec good enough to go up to 10,000 miles using conventional or even synthetic blend oils? Personally I'm skeptical of this. This past Summer I did 7,000 miles highway driving in 2 months using Mobil 1 5W-30, I was at 30% oil life left. The wear metals were low, lots of life left in the oil, the flash point was still good but the viscosity was almost a 20 wt oil. Blackstone showed no measurable fuel in the oil. Although when I changed it there was fuel smell in the oil. It just seems that following Ford's oil requirements and using the OLM with conventional or even synthetic blend oil is not conducive to to long engine life. This is just my ramblings
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Whimsey
Whimsey