The book says one kind. The NH Dealer in Tulsa says another. The book says it matters, Whaddia you say. Book says J-20-A
Im running it with a 990 D Brown tractor. Im told it takes Hytran 15-40.
To tell the truth, I doubt if either of these has either one. Id kinda like to find out what you guys who have NH R Bailers use in yours.