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For the record...

Mobil 1 4T definitely comes in both grades. I just bought 10W-40 "Mobil 1 Racing 4T" and there's an ad on the back cover of the fourth issue of Triumph's official magazine (Summer 08 issue) for 15W-50 "Mobil 1 Racing 4T". Both are supposed to be OK for our twins.

Best Regards,
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