Yes... 10W40, same spec as GPz400/600R... Don´t go for semi or full synth stuff, it´ll probably make your clutch slip and may even stop the starter clutch from working... Go for somthing rated at API SG, SH or SJ (There isn´t an SI..) SL is the most commonly available these days and I´d stay well clear with a bike of this vintage...
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