I've never run any additive in any of my bikes, going back to the late 1960's. As long as the motor oil meets modern JASO MA specs for use with wet clutches, and viscosity requirements as indicated by the bike's manufacturer, it should be good as it comes out of the bottle.
The main thing to consider with using modern motor oils in bikes with wet clutches is to avoid the "energy saving" or "resource conserving" automotive oils that contain friction modifiers that can negatively affect wet clutches. These are usually 10w-30 and below, although we've seen reports of at least one 10w-40 motor oil that has the "resource conserving" mark on the label.
Good Ridin'
slmjim & Z1BEBE
A biker looks at your engine and chrome.
A Rider looks at your odometer and tags.
1973 ('72 builds) Z1 x2
1974 Z1-A x2
1975 Z1-B x2
1993 CB 750 Nighthawk x2
2009 ST1300A
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