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Ashland makes the oil to Kubota spec
Fram does not have a filter that will cross-over. Baldwin filters cross over for HHTA0-59900 would be a BT9358. I would recommend NOT using Fram filters on your Kubota. Use Kubota, Wix or Baldwin filters.
try Wix on line
The motor options that are available for Kubota RTV are; The Briggs and Stratton Pro or Kohler Courage Pro. These motors are available to purchase online at sites such as Ebay.
After some research today with every major filter maker, there does not appear to be an aftermarket replacement available for this filter. Frankly, there isn't enough demand yet to spur the aftermarket into supplying the part, or even researching it further, or so I was told by one major company. Makes you feel all warm and fuzzy!
The Kubota oil filter 15241-32099 crosses to a NAPA #1064 or a Wix # 51064. NAPA filters are made by Wix. Hence the similar numbers.
The Kubota I2900 can now be found online as well as replacement parts for the machine through this website http://www.rockanddirt.com/perl/search?&db=attachdb&sort=36&make=KUBOTA&start=1&method=search
Not sure about FRAM, but it crosses to a NAPA # 3390. Most NAPA filters are made by WIX.
At your Kubota dealer
Estimated New Kubota Tractor Selling Price ; Kubota L 3301. $ 18,621 ; Kubota BX 2670. $ 13,023 ; Kubota B 2320. $ 12,302 ; Kubota BX 2370. $ 11,729.
Kubota's population is 24,464.
The Kubota BX25 and the Kubota BX23 both have good scores or reliability but the Kubota ZD28 has a low score. See a review at http://www.compacttractorreview.com/review/Kubota/BX25.aspx