Castrol website doesn't show ZDDP content of their bike oils...Castrol conventional oil is reasonably priced and I have several Vintage Triumphs with the engine oil shared with the clutch, but not the transmission. These old turds need a decent amount of ZDDP with a weight to protect the cams...Anyone seen a recent listing of the Castrol additive package? They also need a 20/50 oil because of engine internal clearances... Thanks