depending on your weather the heavier 15-50 could be better, 10-40 better in cooler weather. real group IV or V synthetic motorcycle oils are best. in the usa group III which are highly refined dino oils are by new law allowed to be called full synthetic which there are very few real synthetic oils. the fake group III oils are good but not as good as the real group IV + V oils
Has anyone used 15w 50 in their Speed Triple instead of the normal 10w 40?
Have heard that engine noise is reduced and gear changes are smoother - any comments?
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