You can pick up some 10w40 semi synth oil (the stuff that our fazers like) mega cheap at the 'Home Bargains' discount chain.
it's £2 a litre. Yes! £2 a litre!
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- 4 years ago I had this discussion on here and decided to be the Guinea pig to try it out.
- 4 years and several oil changes later, i can confirm it is absolutely fine, and a good price too.
[added to the op as I figured it would be usefull info - biker]