fieldserviceengineer
You seem to know pretty much what you are talking about, but don't you think that a filter that will filter smaller particles of say 10 microns over the 25 micron filter would be a better option.
I also agree with you about a bypass filter. My Dixie Chopper with 25 HP Kohler engine came with a 1 micron bypass filter. Kind of expensive though. When they finally broke the engine down, they said it looked like a new engine on the inside, no sludge at all. I agree with the principle of bypass filtering , it is worth having. It also had a Donaldson turbo air filter.