Just a quick question, I have a 2010 Subaru forester 2.5 turbo and use Royal purple synthetic oil, which they claim you can go 10-12,000 between oil changes due to how good their oil is. So, was just wondering how long I can push my oil changes due to that claim and due to the cost of Royal purple oil? I'm asking because I heard every 3,750 for a Subaru turbo, which I could see for sure with regular oil.