I purchased a new 09 STi, some of these are sadly having engine failures just as the 08's did. It appears that the number four cylinder has issues and that some of these motors picked up bad pistons from a supplier, since then subaru changed suppliers and its "up in the air" if you have a set of the faulty pistons. Regardless, I broke the engine in on the factory fill to 1k, then Rotella-Ted synthetic 5w40. I used this at 2k, 3k and 4k, at 5k I switched to Redline 10w30 using Mobil one oil filters. I plan on doing a UOA at my next oil change at roughly 8.5k, which will be a redicliously short 3k on the redline. If my engine self-destructed while on the Redline, do you think I would have issues with the Subaru powertrain warranty? I also purchased the extended warranty from subaru when I purchased the car to 6years\100k. Thoughts?