Hey, so my buddy sent me this link that explains oils film strength and how it relates to valve train wear of flat tappets and cams. I know our car comes with roller rockers and coated pistons and what ever else is high tech these days, but I thought it was a good read. This guy seems a bit "ranty" but it's makes sense to me and based on his testing - Mobil 1 5W-30 was the best (#10 out of 150 something) off the shelf oil that didn't need any additives or needed to be special ordered. It's film strength is what really grabbed my attention and IMO all modern oils additive pack are all pretty good, so I'm not too concerned there. Btw I ran German Castrol for 30000km and was avg 8.0L/100 km, Mobil 1 0W-30 I was avg 7.9L/100 km for 5K. I'll let you know what I get with the Mobil 1 5W-30, but first impressions are really good. The engine seems a lot punchier, as well as with some WOT 1-5 pulls I'm already into 7.9L/100km at 240 km (just got it changed on Thursday).
I'm collecting samples and having them analysized and will post results when I get them all back. I also remember someone mentioning that the new WRX and Forester XT use Mobil 1 5W-30 from the factory so that also had some bearing on my decision. I didn't want to run a specialty brand either as I like knowing I can go to any store and buy a bottle or two if need be. Anyways, without further adue,
http://540ratblog.wordpress.com/2013...-test-ranking/