I ran a tire and lube for 5 years and at the time Mobil 1 and Amsoil were the two best oils on the market. Tests showed one slightly better in one aspect while the other was slightly better in others but the differences were negligible. Nothing else was close. That being said this was about 11 years ago and I haven't researched it since.

I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!