Those guys over at blackstone-labs seem pretty cool. I'll probably do an analysis with them.
This is what they had to say in an email:
"We suggest sticking with the oil that's recommended by Suzuki, but we don't think using Amsoil will cause any issues. You're wondering how well this oil stands up against others, and we'd say it does just fine. Honestly, we don't see enough of a difference in wear between oils to recommend one over the other, so it's really up to you and how much you're willing to spend.
The wear metals we find are mostly due to the type of use the engine sees and how well internal parts are wearing in relation to one another. The oil type doesn't really make a difference since a poorly wearing engine will continue to wear poorly, regardless of the oil. The same is true for a nicely wearing engine.
Personally, if this were my bike and my analysis came back favorable, then I'd just stick with the same oil, but maybe adjust my interval based on the type of use the engine sees over the course of the oil run. If you find yourself being a bit rough on the engine (track use, racing, or generally harder use), then you might cut the oil run a bit short. If it was easy riding and you were mostly cruising, then you could probably let the oil stay in place a little longer.
We'll be able to help you out a lot more once we see how your engine is wearing. Once you see the results, you can decide if you'd like to experiment with different oils or stick with Amsoil. It doesn't hurt to experiment, and we actually encourage it since there are factors that we can't see in analysis that might impact your decision (the engine might run smoother or make less noise, for example).
If everything is fine on your end, I'd stick with Amsoil for now and wait to see the results.
If you have any other questions, please feel free to ask.
Thanks for contacting Blackstone!
Samir Kharbas
Blackstone Laboratories "