Yeah, I will do one eventually. I want to run it one cycle first. Yes, I do not want to have to add any oil during the 9k mi. interval, save for 1 qt. tops...but, seeing the stats on oil consumption with the M3...who knows...
But, I'll tell ya, you get what you pay for. This lube is awesome stuff...do not be scared of the 60 weight at all. The car takes off and runs waaaay better than M-1 15-50...and runs smoother than the Syntec 5-50 which is good stuff and I'd still recommend it, but since did some good cleaning out of my internals (better than M-1) I wanted something slightly thicker....as they thinned out their SL formulation. The thrust to try it was also on the heels of replacing the rear diff fluid with the spec'd Castrol SAF-XJ (75-140)...diff runs mucho better than the thin OTC Syntec 75-90. These are quality lubes...but time will tell...will keep ya'll posted...