my brother is a manager at a automotive shop here in kansas. last summer when i was changing the oil in my harley- davidson, he saw that lucas made a 20-50 synthetic for motorcycles. he told me to try it. if it work as good as it does in car as it does in motorcycles i would be impressed. boy was i impressed. the bike went to srurgis in august at 80-85 mph for 13 hrs. only stopping for gas and a quick bite to eat. then it went through some cold weather in north dakota,wyoming and back to kansas city non stop again. the ran cooler and i had a better constant oil pressure with lucas. i'll leave mobil 1 and use lucas from now on in my harley and my truck and car. thanks for a great product.