Liqui-moly looks like good stuff actually, we do the odd BMW (terrible cars by the way) at work and we use the long life 5w30. Also use the liqui-moly power steering stuff in them.

its important to note that Subaru genuine fully synthetic is API SM rated, while the Liqui-moly is API SL rated. The higher the letter, the better the additve package.
I still use Subaru 5w-30 in my car, and its done 230000k's and it doesn't use a drop.

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F.B. Racing
01 WRX (STI badged)
2010 XR5 Focus
06 Impreza Hatch 2.0i