I have always heard that it all comes form the same barrel and that paying the extra for name brand stuff is a waste. I always used injex and have had no problems. Yesterday i picked up some new stuff that i found. Called arctic blue. Says it meets and exceeds approval from major sled manufactures. Any body have any comments on this stuff and what they use. I hate paying so much for oil, if it is the same. THis company makes both reg. and semi syn stuff. I have a '98 ZR6 w/ carbs.....