Kohler recomends that you shop around for the best price on one of the original filters that fit your particular model. For best performance original parts are recommended.
You really can't go wrong with lawn mowers. Any oil filter will do there really is no wrong choice. Just find one that matches your type and size of the model Kohler engine you are using. It'll be located in the manual.
Kohler engines have there own oil filters. The filter is based on the model of the engine. The best way to get the filter is take the model number of engine to a small engine shop and get the correct filter for the unit. Replacing with the wrong filter may damage your mower.
The owner's manual will recommend a 'Kohler' brand oil filter but, any filter made by the regular manufacturers will do just fine. Just stay away from the cheaper, generic brands.
We recommend that you use only Kohler filters available from your local dealer. In an emergency, you can go to any small engine distributor or dealer for recommendations.