I see alot of people use mobile 1 synthetic oil. Being I race dirtbikes I try to use the best oil around cause I have to change the oil in my bike about ever 10hours of use. Amsoil conducted a study between the leading brands of synthetic oils for cars as compared to Amsoil. As expected Amsoil left minimal wear scares on the engin components. As for the leading Synthetic oil brands, Castoral Syntec Left the LEAST amount of wear scars and Mobile 1 Left the MOST wear scares. Any Sythetic motor oil is better then conventional oil but the best "Cheap" synthetic oil is Syntec.