K&N is the only one I know of as the filter has a very fine thread. I just get original oil filters off ebay, like 3 for 15 bucks shipped. Remember there is also a particle screen at the drain point so your sort of getting double filtration. I have used T6 for years with excellent results as have many others. Watch for sales, in my area I can find it for 20 a gallon on sale. I also use it in my other toys and have Kymcos approval for use in there UTV.