I just picked up a 2013 Outback Premium with the CVT. It requires 0W-20, but I think that's too thin. I read somewhere that this is becasue of the CAFE laws. I read on a Amsoil website that 0W-30 Signature Series or 5W-30 would be better. What do you folks think? I don't want excessive wear for the sake of (marginly) better gas mileage.