When I changed the oil at 4.2hrs, I started it draining and got pulled away...came back an hour later and unscrewed the filter...this allows all that oil to then drain back to the pan and out the drain hose. I let this drain awhile longer, wiped things off, screwed on new filter, screwed-in drain plug into drain hose, and filled it with 3 quarts of Castrol HD-30 regular dino oil. Checked the dipstick and it was spot on. (even though manual calls for 3.1 qts) I mowed the next day, and checked it later that night. I had to add that .1 qts to bring it back to the FULL line. Since then it's been fine, but didn't check it last night. I'll keep an eye on it, but this is one of the only OPE air cooled engines out there with an extra quart of capacity. Kawi's all have the 2 qt capacity...not sure of Generac, but they really aren't being used. To me, topping off with a 1/4 qt once during an oil change cycle isn't a big issue. As far as hydraulic lifters go...I demo'd quite a few machines over the years, and every one that had a Kawi FX series in it had BAD valvetrain noise. Now some of these were new (some brand new with 0 hrs), and some had some use on them, but every Kawi FX I used made me not want one on my machine. Plus, the added maintenance of a valve adjustment after a few hundred hours seemed like I was going back to the 60's with solid lifter Duntov cams in screamin' small blocks. I've had some good and bad Kohlers in the past, and saying that means absolutely nothing. As this engine uses no similar parts to those older Kohlers. I owned a dreaded 25hp Kohler with the head gasket problem. Once the headgaskets were replaced, the engine NEVER had the power it had prior to the failure....I do not think it was placebo, as I had to readjust the carb to get my RPM's back where they needed to be to cut properly. (1997 DC Flatlander). I swore to myself that I'd never own another Kohler, and bought a LC'd Lazer with the 27hp LC'd Kawi, which was a big step up in refinement and noise.