[s-cars] Synthetic oil weight rec's

[Wylie Bean]

s-hedz,
Not to start a "brand" debate, but I'm a typical Castrol 20W-50 user, and would appreciate rec's on what weight full synthetic to use since I'm not finding anything. Is Rotella 15W40 a wise choice (dino) or should I move over to Mobil 1  15W-50? (sucks that it's not sold in 5q jugs but oh well).

Wylie Bean
TheRingmeister at triad.rr.com
90 cq
91 90q20v
92 UrS4
08 Q7 3.6
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