One of the things I really hate to do is change the oil on the mowers. So I designed and installed a pre-lube system on the mowers. It's really nice to be able to change the oil and filter in under 3 minutes. I decided to make it a pre-lube system as well. I push a button for 5 seconds and the oil presure is up before I turn the key. No dry starts. Everything I've read say's that's when 60% of the wear takes place on any engine. I put a hydraulic quick disconnect on and a ball valve to redirect the oil out a hose into a milk jug. Just turn the ball valve and connect my short 3 foot hose, press the button and all the oil is pumped out of the engine. Screw on a new oil filter, done. Oh yeah, put new oil in!! Took me some time to get it just right but now it works perfectly. It has been use on boats for years, just adapted the system.