I have a Toyota/Scion FRS with the new FA20 subaru engine. I'm normally very consvervative buying cars with a proven track record, but this car hooked me. However the subaru engine gives quite a bit of apprehension. The manual calls for Toyota 0W-20 but says the use of a higher viscosity "may be better suited if vehicle is operated under extreme load conditions." It also calls for 3750 mile OCI which is low for 2013MY. Growing up in the flat cold midwest I was a firm believer that the majority of engine wear occurs at startup and the new lightweight oils are great. But I live in a very hilly area of PA now and consider my daily commute an extreme load. Engines just don't last as long here as they do in flat areas. Very steep multiple hills. People blow out clucth slave cylinders and pressure plates fail at an alarming rate in this area. I tend to cruise at a relatively low RPM, sometimes its hard not to find yourself lugging up a hill in too high of a gear. The other thing is this is the first Boxer engine I have found to recommend 0W-20. Right now I have SuperTech 5W-20 in it, Walmart is the only place open in the middle of the night. It is very inconvenient for me to get to the dealer as I live quite a distance and work nights. Also with these new GL-5 requirements and the big reduction of moly I have trouble swallowing the extra expensive for the OEM Toyota oil, there is no "proof" they are using the new "super" moly compound. I understand this site is very data driven after reading thru posts but I am dealing with a brand new engine design and a boxer at that. So some speculation is required, I think its also the first DI boxer engine every made. If I were to go out of my way for an OEM oil I would probably want the Mazda High Moly 0w-20. As my goal is not an extended OCI, rather high engine lifespan/ lowest wear. I know subaru engines can be quirky (especially first year models.) I want this thing to last me 200k+. So the question is do I stick with SuperTech 5w-20, find something else at Walmart, or track down the new Mazda high Moly 0W-20? Any advice is appreciated.