the oil
1 like you i already have it on hand
2 no super slick add on's to make wet clutch slip
3 find it in lots of stores or truck stops
4 cheaper than oil at MC shops and just as good
5 i am very cheap i turn the bottles upside down when filling my other cars and let the cling in them run into a 1.2 L jug
when its full i have an oil change for the bike ....my friend next door has
2 trucks that use it and i get the cling from his bottles as well.. the rt125 gets several oil changes a year