In this video, I explained why small engines like the Kohler 7000 and many others need some special oil. Just like classic cars, diesel engines, and various other types of vehicles, different engines different oil.

The easiest to find filter for this application would be 51348 from wicks, which is slightly larger and therefore increases your oil capacity a little bit. Racing/classic car oil like the vr1 from Valvoline featured in the video or penngrade green oil from Brad Penn works great!