I have a BX 1800. The oil filter the dealer has been providing me with for 4 years is 15853-32430. Sometimes it is black and sometimes it is a white Kubota one but always the same size. The last time I went in to get some filters they gave me filters that were much smaller with a HH code on them. I didn't notice the size difference til I got home (50 miles from the dealership). Has there been a change in the size of the oil filters for BXs? If so does that make them less effective? Are there better sources for high quality filters for our little pals?