Very good stuff. I've been using for years. Back when bikes were air-cooled and had more localized hot spots, I could really tell the difference in deposits & overall cleanliness. Synthetics in general are more stable at higher temperatures (up to 50 degrees higher)and shear strength is much better, which is especially important when your clutch, tranny, & engine all use the same oil. My only concern is that some people use the superior properties of synthetics to greatly extend oil change intervals, and bikes are hard on oil. Way back in the early 80's(had a small bike shop then), I sent a dozen or so samples off the be analyzed and conventional oil was degrading as early as 1500 miles. No hard facts to back it up, but even with a synthetic, I don't like to go much over 3K miles. Probably preaching to the choir here, but MC specific oils usually have less friction modifiers and more anti wear additives, which might be better for the clutch if it was marginal to begin with.