I have an '04 WR450. It took me close to an hour and I was just not prepared to have oil shooting out of 5 holes at once. What I don't understand is why would they take a bike and make it where you have to change the oil so often and then make it so time consuming? I could understand often but easy or seldom but difficult but both often and time consuming seems crazy to me. Well......I'm not getting rid of this thing as I love it too much so I'll just have to find out some of your tricks. First, do you do the full oil change (per the service manual) every time you change it? When you change it do you have to take out all of those little bolts to drain or is it ok if a little oil stays in it? The smaller of the two bolts underneath on the left side was a pain to get back in as it leaves no room to get a wrench in there to tighten it. Also, what's the point of taking out the strainer? The holes in it were so large that it was totally clean as I can't imagine getting anything trapped in that. I didn't do anything with it and just put it right back in. So what will happen if I just open the main drain bolt and drain as much out as I can and then refill it with fresh oil? I mean doesn't most of the oil come out? Do I have to clean the oil filter every time? I'm just trying to be realistic because there's no way I'm going through what I just did every 4 rides so I'm trying to find a happy compromise. BTW- when people say to change it every 4 rides what dictates a ride? A 30 minute mellow cruise on a trail or a 4 hour romp at the track? Thanks!