I hope the pdf I'm linking to below doesn't change the date each day, but if not, it looks like there's a new spec sheet for GC and it's Syntec siblings. Interestingly, GC (0W30) and BC (5W40) are the only two Syntecs to not be rated "SM"... I assume due to the desire to put protection above enviro concerns with these particular oils. (Hopefully, I won't trigger an avalanche of dispute over the above comment! ) Anyway, here's the new Syntec Spec Sheet.