I use Mobil 1 15/50 in my BMW R-Bike. It is Factory fill for Porsche, Mercedes, Corvette, Viper, etc... The major benefit is that it doesn't lose its viscosity (retaining about 85%) between change intervals. It is better protection. There is some argument wether
it is worth the extra cost if you change your oil often. I leave Mobil 1 in for 5 or 6k.