The bottle says, "Full Synthetic", which probably means it's formulated from 100% Group-III base stock. All well and good except it's not rated for diesel use. THAT puts it behind the name brand syn-oils right there, though it might be fine for gasoline passenger car and light truck use. But is any Group-III base stock motor oil really worth $3.00/qt.? If they sold it for $2.00/qt, I'd be tempted. (But not before I use up 48 quarts of Target's 68 cent Havoline Group-II 10W-30 dinosaur juice first...)