I never was a fan of the Shell Optimax/VPower, goes back to the bike riding days, my R1 used to run like a pig on it, i found the best to use were BP ultimate and Mobil 8000, as the bike ran a lot smoother on both those, the Caltex/Ampol versions were only used in situations where there was nothign else but didnt have any adverse effects.
Now, I'm on Diesel all the way. and the only bike i got is 1 human power.
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