A fast google of nv4500 oil finds there is a bit of confusion about how much it takes. Some say factory specs call for a gallon. Some people claim it will hold 5 quarts. I think it is like posting "Knuckle Pudding" here or on the G. Then just sit back and watch people argue.
I put a gallon in mine 5 years ago. My input shaft bearing was making noise then and it still makes the same amount of noise now.
Advance Adaptors uses another brand now than the Castrol stuff I bought from them. Still expensive though.