Like many others, I have experienced "issues" with this Kohler engine. I purchased the mower new in 2006, it has 177 hours on it. The engine recently stopped running altogether. Since it had a new battery, I changed out the starter solenoid. (Starter is new) Still no start. I dropped the deck and took to a reputable service center. Fly wheel was jammed and apparently there is some damage to the interior. Not sure what may have caused the damage, possibly when serviced and the new starter put in. The service center suggested using an automotive product called Restore. I used this product years ago in a 70 Challenger and it did wonders for the engine. Long story short, engine is blowing a little oil at first but smooths out and runs great after a couple minutes. Since I have livestock and use the mower all year long, the service center suggested an oil change after the first 10 hours using a good 10w30 oil and 8 oz of Restore, then every 25 hours thereafter.