Not surprised at your results.

I've seen Motul 300v samples from 350z's and they didn't look good either. I think you should switch oils. RLI, Mobil1, Nissan, or even GTX would do you better than this 300v.

The ones that were compiled into a chart on the other forums a while back? I've seen those too, and I don't think the Motul is the issue with the Al in this sample. That other collection of charts was very low on samples and mostly taken during break-in, and isn't really statistically valid to draw any real conclusions from. I think the 300V is doing fine. Possible causes of the jump in Al: Engine abuse (breaking 260F oil temps multiple times testing the oil temp stuff), break-in (some Al is expected during break-in, perhaps changing oils just changed the slope of the breakin wear over time), driving harder in general (the previous analysis I was still babying the engine a bit, in this analysis I'm not at all). Longer change interval is a factor too, and the response to that may not be linear.

Other smaller probability possibilities: That I didn't have a FilterMag on the previous analysis (at least not the whole time), and this one I did. Perhaps with the FilterMag taking more ferrous metals out of the solution, more Al is able to make it into the sample/analysis (Al doesn't stick to magnets) proportionally. Also, the lightweight underdriven pulley has to be considered. (1) It's made of Al, so if there's any unusual wear of the pulley itself going on at the crank interface or the seal, that would show up, and (2) there's also the possibility that it has affected harmonics and balance in some way that's causing piston wear (although Stillen has claimed there can't be any ill effects from this pulley and I'm inclined to go with their explanation).

In short, there are a lot of possible causes, some of which are really nothing to worry about, and the 300V is pretty much at the bottom of my list of things to consider.