A mix, about 40mi every day or so and sometimes 20mi, this also included a trip to San Francisco which was about 500mi total. I also drive in the mountains often and I have a bit of a lead foot on on-ramps and in the mountains :)
Right on.
Doesn't sound too bad, but remember, highway trips (preferably spirited) are your friend.
Do you go WOT when you drive hard? Try not to go past 80-90% on this next OCI and see what happens. Most ECUs usually run a little rich at WOT, so that might cut down on your fuel dilution without actually slowing you down.
Also, what part of the UOA shows the fuel dilution? As I am learning
Well I can't be sure because I'm only an amateur myself and the report doesn't give all the necessary data. However, I'm guessing there's fuel dilution because:
- Both the flash point and the viscosity are much lower than the virgin oil
- This happened with every oil you had, including Red Line 5w-30, which never thins out unless it's diluted (as far as I know)
- Subaru engines are usually very easy on oil, so they're not likely to cause shearing except maybe with track use