OK, so your bike may not be in the first flush of youth.  It may even be quite old.  If that is the case, sometimes using the most up to date lubricating technology can be detrimental to machines designed to thrive on oils with lower synthetic content, different detergents and often a fixed SAE rating.  Here you will find all the oils you need, all built with the same character as your bike, to keep it running as sweetly as it did when you were sweet sixteen.