I ran Pentosynth 5W-40 for a while in my VW 1.8T. It performed well, I have a couple of UOA's of it posted here. It did thin down to a 30wt during a 5k run. The stuff smells identical to GC, but it's not green. I stopped using it because I hate having to order oil and pay the shipping charges. GC is available locally, it's cheaper and has performed well in my engine. If the new GC turns out to be a dud, I may give BC 5W-40 a shot.