RE: Source for Nitromethane?
Fluid Ounces. You can buy your oil from Fox, Sig, or Morgans. It is about $20 per gallon for castor oil, and a little more for synthetic. If there is a go kart racing shop in your area you may be able to buy oil cheap from them. I also recall VP sells oil but you might have to buy 5 gallons at a time.