Robzombie, the mobil 1 15-50 is automotive oil available everywhere. The 20-50 mobil 1 V-Twin is motorcyle specific ($$$). I use the mobil 1 15-50. Either mobil 1 is superior to HD oil.RobZombie said:As a user of only HD oil up till this point, I guess I should ask....is the Mobil 1 15-50 sold as automotive oil or is it cycle oil? I like the possibility of finding oil that is more readily available, but I don't want to make a stupid mistake.