What oil lasts the longest?

What oil will I be the safest to run. I want to run the oil as long as possible. What oil weight should I run? I think I'm gonna buy a bunch of amsoil. What is the best amsoil weight and which kind is the best and cheapest for the yzf/wet clutch.

Not starting an oil thread just want an answer cause im getting ready to just buy a lot.

Please use the search feature! This topic has been beat to death. :applause:

Well if you want to run the oil for longer definitely use synthetic. I always run 10W40. Its really best to change the oil after every good ride if you can. What bike are you running? The new 450s only hold 1L, so the oil is well used after a hard day of running.

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