Originally Posted by DieselDiner
It has a superior HTHS value than M1, which is one of the values I consider important. It was superior in other ways, but I don't have the values in front of me to quote.
It also has superior viscosity at 40c, and a much better VI. Mobil doesn't quote volatility figures, so don't know about that one.
Either of these oils is fine for our application; I just gave GBD my opinion on what I prefer.