Originally Posted By: oil_film_movies
Most of the cause of the low-ish 7.86 KV100 visc was fuel dilution, with some amount of normal VII breakdown. Both things cause thinning. You only had about 10% old residual 5w20 Eneos mixed in, so that contributed very little to the ending KV100 despite what Blackstone said (use the moly ppm to calc how much residual oil you had, 10% is it).
Still, 7.86 is a 5w20 KV100, just a little on the thin side compared to most 5w20's available. No problem really. This engine is spec'ed to use about a 7.86 KV100 for good Stribeck Curve behavior, so you're fine.
You were smart going with a 0w30. Any time fuel dilution is expected, this is a good idea to a step thicker. Keep using that one.
Your choice of a Fram Ultra is excellent too. (You must have read a few oil filter threads on BITOG here!)
Good low iron wear rates. TBN was high, meaning you didn't run out of acid-fighters.
I think you could easily take it to 10,000 miles with that style of driving. But maybe best to just follow what Ford's iOLM says to do.
Good to hear and thanks for the useful info. The Fram is a wicked deal really and it's probably going to be my go to for every vehicle here on out. I want to run one long run on the 5W20 to compare and I think I may end up sticking with 0W30 based on the results. That's why I initially bumped up to that. Ford calls for 10k and I don't like to run that far without knowing for sure that I can and I want to confirm doubts over dilution before pulling the trigger
This forum rocks, tons of awesome info and help to assist with preserving our vehicle for years to come. The 1.0 is stout!