After 20 plus years of wanting a riding mower I finally treated myself to a John Deere S240 (first time rider owner) So now begins the circus in my head on what Oil to use, and realizing there are also different oil filter choices than JD or Kawasaki. I suppose I could keep it simple stupid and just buy the JD turfgaurd or Kawasaki oil and corresponding filter but if you are on this forum, you are probably overthinking it like I am. The JD Turfguard and Kawasaki oil is way overpriced, especially as the the JD is Conventional oil, that comes with a price tag of 8-10 dollars a qt., Id prefer to at least run a Syn Blend or Full syn anyway. Ive read so many conflicting info regarding these engines and what oil to use online. Some say use the JD Dino because its formulated with the proper additives for a lawn tractor. Some say to avoid Full syn in this mower, some say to use Full syn. I do know Kawasaki recommends 10-40, while JD recommends 10-30, neither company speaks to whether to use Dino, Semi-Syn, or Full Syn . I will be going with a 10w30 because it suits my situation with use and climate. I was perhaps considering using Rotella T5 if I can easily find it, otherwise I'm still considering, and open to suggestions. Any insight on this Oil/filter topic would be appreciated!