I just finished my first oil and filter change on the 450. What is that all about? Who set that procedure up? Holy crap... I think my spine almost fell out.. I'm sure it will get easier when I get the procedure down but this first time was a bitch. And of course the oil tank screen was totally clean. It is real rewarding when you take out one of the little drain screws and 1 tablespoon of oil drains out... Wheew, glad I got that out of my engine.