I saw another post mentioning this but I thought I'd start my own... I was always a firm believer of changing the bikes oil before riding it in Spring. My local dealership (not the one I normally go to, but the closest Suzuki dealer) said it was "a waste of time and oil" to change my oil in the Spring if I had just done it a few hundred miles before storing it for the Winter.
Let me preface by saying I'm not one of those guys who goes out and starts their bike every couple days or weeks in the Winter. I'm a firm believer that this does more bad than good. My bike goes up on stands, battery tender plugged in, gas tank filled to the brim and a cover goes on it. Period...
So, the other day, I pulled her off the stands and drained the oil. It was the most disgusting oil I've ever encountered. It looked like chocolate milk with yogurt swirls. Nasty looking oil. Have you ever seen what condensation does to oil? Well it did it just sitting over the Winter. I think I put mine away in October last year, maybe November, I don't remember.
Just letting you guys know how just a couple months of sitting can destroy oil... And of course gas.. I drain my tank every Spring and run it in my truck (under warranty LOL) or start bonfires with it...
So in short, CHANGE YOUR OIL IN SPRING, NOT FALL! Or better yet both for all us anal-retentive folks...