Repsol  Moto 4T 15-50 petroleum only oil

[vmaxmyer]

Has anyone had experience in using the Repsol Moto 4T 15-50 petroleum oil? It seems to be working well my 2007 in the summer weather, but was told NOT to use Repsol's semi-synthetic because it had Moly and was bad on the clutch...True/False???

 

[roadthing]

Molybdenum disulfide + Clutch = Slipping.

It won't happen immediately, but as the MOS2 builds up on the clutch pack, it will eventually slip. It's a great component for bikes with independent transmission cases, or primary drive cases, but not for an engine that shares it's lube with it's transmission.