These “never drain your oil” mowers/engines are nuts. I would never buy one. I’m one of those who over maintains my equipment. An example is my backup portable generator.. I change oil in it once a year - regardless. I occasionally start it, bring it up to temperature and test the output...
Several years ago, I bought an oil vacuum extractor. A plastic tank that has an internal manual pump that creates a vacuum. With the included hoses/tubing you’re able to remove all of the old oil without any mess. I’ve been fortunate enough it also works really well on my truck and car. Costs...