I would not recommend the use of Motul's C2 chain lube, at least not for an X- or O-ring chain. Last season I put a new DID 525VX chain on my Fazer8 and used C2 on it religiously. Always kept it clean, never seen rain etc. What I've seen however, is the chain beginning to toss X-rings out. I also noticed that the lube's "tack" is super, super high and while that's good for not throwing off, I think it gets too gooey and thick and viscous which may damage the 'rings simply through mechanical tearing.
I had a 15T front sprocket on the bike and recently decided to go back to the OE 16T part. When I pulled the sprocket cover I noticed a bunch more 'rings inside the cover and a thick, tar-like mass of tossed-lube inside. To get the mass out I had to scrape at it with a tool; it wasn't enough just to wipe it out. At that point I concluded that the lube is simply too tacky and too viscous for fragile X-rings.
I'm using basic
Maxima chain wax now.