I'm still waiting to see if Professor Pat will be chiming in here!
I run the 4T (or T4) in my bike, and Royal Purple in my car. I am thinking about doing the swap over to RP in the bike to... just haven't decided yet.
04 Speedy, 904cc 12:1 CR JE pistons, ProCom CDI, Nology coils, Hotwires, lightened flywheel, CR ll's, 18 tooth front sprocket, freak kit, cocktail shaker and scypter exhaust, bobbed rear fender, headwinds headlight, wires in bars, and Scott Oiler
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