I have the Redline 75W90 in my box right now, and it's fine. The Mobil 1 you buy in the gallon container (which is a completely different product than the stuff you buy in a quart) is excellent, and is supposedly used by Farnbacher Loles.
While I have not tried it, according to Paul Guard (of Guard Transmission fame), the best stuff available is from Lubrication Engineers.
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Boxster S
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