Just curious about a maintenance issue. How often do you guys replace the o-rings for the oil filter cover? I am talking about the big one and the three little ones. I have had my '00 426 for about three years now, and changed the oil at least 6-7 times a season and never had a problem re-using the o-rings. This last oil change though, I had to replace all four to get the cover to seal up. Obviously, they were due to be changed. It sucked only because I don't have a local Yamaha dealer and had to shop online and wait over a week for them to arrive. I couldn't find any in my o-ring assortment kits that would fit perfect either. But, do you guys change them once a year? Every third oil change? Or wait for them to leak, like I did.