You're making a mountain out of a mole hill! Just use any named brand, fully synthetic oil. The MX shop will sell good stuff, and if it's right by you there's no need to worry about switching brands, as you can just pop in there whenever!

On the bottle it will say something like "pre-mix", "injector" or "suitable for pre-mix and injector systems". If in any doubt, just ask the supplier. The labels are often colour coded. Silkolene used to be purple for Pro2 (synthetic injector, years ago when I first used it!), orange for Comp2 (semi synthetic suitable for injector & pre-mix), and yellow for pre-mix. I don't know how it is now though... read the lables, and ask someone!

Of the list you give, personally I would chose the Silkolene and then Motul. I myself only use Rockoil or Castrol. You can mix synthetics (mix brands) if you want, but I don't see why you'd need to, living next to the shop! Just pick one, and stick with it best you can.

Top tip:

Top the oil bottle back up after EVERY ride, and that will ensure you (virtually) never run low and have to go hunting for synthetic!
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Andy.
NSR-WORLD.COM

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Last edited by Andy on Sun May 29, 2011 2:40 pm; edited 1 time in total