Any of my Canadian (or American) friends out ther have an opinion on the Motomaster motor oils sold by Canadian Tire? I currently use the Motomaster Formula 1. I also know, through extensive research that Shell supplies all Motomaster motor oils for Canadian Tire. I received emails from both parties to confirm this. I have read different things about the Motomaster Formula 1, Motomaster 100% Synthetic (comes in a blend also). Have also heard that the Supreme is pretty good too. After all, they're brewed by Shell. What's everybody think?