I almost bought 5 bottles of this stuff today to put in my van, but something was nagging at me as I stood there looking at the oil in AutoZone. So I just purchased one bottle "just to see what's in it." (And also to scan in the label(s) and send 'em to Patman.) Well, according to Castrol in Germany, the 0w30 Formula SLX is GREEN, and the oil in this bottle AIN'T GREEN. It's a very dark amber, with a SLIGHT green tint. But when someone says an oil is GREEN, I think about the Kendall GT-1 I used to use when in high school. That oil was GREEN. Period. No amber. So...I don't know. Maybe this is the SLX...but maybe it isn't. I will say this: it doesn't SMELL like the other grades of Syntec. It smells just like the old Mobil 1 TriSyn. I guess Patman can chime in here and let us know just how GREEN his oil was.