David, My 2004, 20 hp kohler command, horizontal shaft, has 1800 hours on it. Doesn't use oil. Had to lap valves on one head. I run mine 2600 rpms. Good engine, so far. It has hydraulic lifters and roller main bearings.I change oil and filter as soon as oil turns dark, between 60-75 hours.
Boys at the mower repair shop say they have seen those with 4-5000 hours. But like everything, parts do break. geo Boy had a briggs on a John Deere push mower, the bolt on crankshaft came lose and rod went out the side of motor. Very low hours on it.
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Today's Featured Article - A Cautionary Tale - by Ian Minshull. In the early 1950s my father bought an Allis Chalmers B and I used it for all the row crop work with the mangolds and potatoes, rolling and the haymaking on our farm. The farm and the Allis were sold and I have spent a lifetime working on farms throughout the country. I promised myself that one day I would own an Allis. That time event
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