I have a Deere L-110,bought in 2003 with the Kohler 17.5 engine. I have been using the Kohler filter and the JD Turf Guard 10W30 oil.Changing oil and filter every 25 hours as directed by the owners manual. It now has 105 hours on it. Any recommendations for another brand of conventional oil and what about the change interval. I believe the Kohler web site says every 100 hours.What about changing the oil every 25 hrs and the filter every 50.Thanks in advance.