By "classic," of course, I mean green. . Anyway, both because I've been meaning to try it, and because the question has come up in a GC thread in the UOA section, I decided to try a blotter examination. The oil is GC, of course, it's been in my VQ35 for almost 3,500 miles over (just under a month). The car has 48.5k miles on it right now. The first two pictures are drops of of the used GCC, straight off the dipstick. A large one and a small. The last two are of a big slosh of virgin GCC from the bottle I keep in the trunk (it was windy and dark when I did this...). On the last, I used some photo enhancement to try to show that there is a slight "ringing" even with the virgin oil. Although the oil has somewhat darkened on the dipstick, this stuff looks pretty clean compared to some blotter shots I've seen. There is absolutely no metal debris visible to the eye, even with light magnification (my reading glasses...). Don't worry, I'm still going to do UOA when the time comes.