Hello I have an older craftsman green machine series 917 42 inch rider with the Kohler 15.5 command engine. It's been great and I love the oil filter filtration. Pretty simple engine to work on, reliable as helk, and what I see is better than the newer Kohler courage series engines. I am in the need of a bigger rider mower due to expanded yard. (48-54 inch cut) I see motors are greatly bigger in hp that my Kohler. So, I am curious what engines are most reliable both in the Kohler and briggs. I want simple maintenance and cheap upkeep. I see that the briggs 21hp platinum are nightmares and are prone to expensive repairs. And I see some briggs opposed engines may be an issue here and their. I would apprecaite any feedback.I really like the older stuff because it was built better that the new stuff.