FYI i have a scag turf tiger with a 27hp kawi with 450 hours on it (owner/operator) i take very good care of it!! recently i have noticed that oil consumption is WAY up. as soon as i bought it i noticed that the air cleaner had "leaks" and there was no heavy duty optional upgrade (is there???) now my buddy who owns the same mower with 650 hrs started getting major oil usage and a knocking noise turns out his connecting rod bolts started to back out cause? theory #1 - low oil=high heat=expansion of metal=wear after cooling causes "play" in the connecting rod crank toloances and upon starting causes vibration that loosened the bolts. theory #2 bolts just backed out my dealer says that briggs says, a quart a day oil usage is "normal" now he says kawi is "replacing a lot of motors" dirt=wear=motor death is my theory anyone agree? ifso what do i do?????