How do you guys tell if its green Syntec or gold Syntec by looking at the bottle numbers? I got a quart today from the local Autozone with the red label made in Germany and its 0w-30. The number reads M033246B251051-3, what do they mean? I don't want to open it yet cause I won't need it for a while so I don't want it to get contaminated in any way. Thanks.