Got a new 2001 Kohler 23 (with Donaldson air filter) on order for my Scag Turf Tiger. The old 25 barely lasted 1360 hours with one complete rebuild, new intake manifold, new valves. And that with oil changes every 50 hours and a new filter every 100 hours. All to find out that the main bearing had worn out the block causing the flywheel to hit the ignition module, resulting in loss of power. I've read the posts on Amsoil bypass filters, but haven't seen anyone with an Amsoil bypass on a 23. There used to be an oil that Snapper promoted (I think) that would double the manufacturer's engine warranty if used exclusively. Anybody tried that? What's your best advice for breaking in this engine?