Dumb question. Read over on the Shell/Rotella website a really long post regarding what oil to use in motorcycles. Quite a few guys swore that Mobil 1, even though beging called 100 syn., doesn't use 100% syn. basestocks. I opened my mouth in reference to this and was charbroiled on the spot. Is there any truth to this idea? Can an oil claim 100% fully synthetic and not be made from 100% syn. base stocks? I realize how stupid this sounds but have to ask it anyway. Besides, I'm a "newbie" here! Thanks.