Product review (5 stars): It was a perfect match to my old Craftsman Garden Tractor
It was a perfect match to my old Craftsman Garden Tractor. I replaced the old Hydro gear transaxle filter with this 51563 spin-on filter and also replaced all the motor oil with a 15w 50 synthetic Mobil 1 oil, and purged the system and was completely satisfied with the results.  The tractor is up and running now.