How much Oil capacity 1982 Yamaha xj650?

From the service manual for a XJ650G:

Periodic oil change - 2.35 Liter [2.5 US Quart]

With oil filter replacement - 2.65 Liter [2.8 US Quart]

Hiflo Filter HF144 KN Filter KN-144

Use an oil without energy saving qualities, the friction reducers these oils contain will make your clutch slip or chatter. Gossip on web claims diesel engine oil does not contain this additive and 15w-40 Shell Rotella is a good oil readily available at Wal-Marts, personally I use the Yamalube full synthetic 15w-50 oil in all my Yamahas...