Thanks for sharing your info. I've been searching for the dipstick and fill bolt for my 3010 for a couple of days now! The owners manual clearly shows a dipstick and fill bolt near the PTO engage lever.
As for the difference between the 3010 and 3010S, Near as I can figure, the 3010 was made back before New Holland was bought out by Ford. When the company became Ford New Holland, they produced the 3010S, which was essentially the same tractor with just a little less hp. I think the dividing line is somewhere between '02 and '03.