10w40 motor oil. DO NOT USE SYNTHETICS. Just use the basic motor oil with no "Special" additives. The additives / synthetics can swell or shrink the clutch friction plates.
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Use what Yamaha recommends and do NOT use basic car oils. Especially oils marked energy conserving. The have non friction additives that can cause wet clutches to slip. Synthetic oil is okay as long as it is for motorcycles.
SOURCE: cleaning transmission
You can flush it out with ordinary kerosene. No need to spend lots of money.
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