Here is my UOA for my 2012 WRX Switched from factory fill at around 4,000 per the dealer.
Factory Fill (4k miles) -> Castrol Syn 5w-40 (4k miles) sitting at 8K miles on rig, total.
hope that wasn't too confusing.
Stage 2 cobb tune 93
Thoughts? I am now running rotella t6 5w-40.