interesting fact: I got hold of the GW 'oil engineers' and was told that the SynX stuff is ethanol tolerant. you wont notice more that a 1kw difference, only downside is sougi 10,000k changes, and synx will need 5,000k.
fact that its mineral/synthetic mixture is abit of a ehhh, but at 5,000k changes wouldnt cause problems right?