ATF is OK, I just didn't like the notchy rough shifting feel it gave my '03. It felt like you would expect, thin. My '07 and '12 clutch and shift great with anything. Even with the 15W-40W dino Rotella, in gear dead engine starts are no problem. Considering all the experiences I've had with different oils and bikes, I would say that the oil sensitive bikes are probably on the tight side of clutch release travel, or have slightly out of tolerance parts that are mitigated with the lighter oil.
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