I did a search, but didn't really find what I was looking for, so here goes: I have a DS'd '05 WR450 and plan to do some long trips with it in the future (1000+ miles). Trips that long kind of pose a problem, because it seems the consensus is that oil should be changed every 500-700 miles at the latest with this type of riding. In the interest of stretching those intervals a bit, I'd like to increase the oil capacity of the bike. I read a post by Grayracer a while back mentioning that you could safely run 1.5 liters of oil (1.2L is specified) in a steel framed WR with no problems and I intend to test that theory. However, I'd like to see if i can increase it a bit more than that if possible via adding an auxilliary oil tank. I'd be extremely happy if I was able to get 2.0L of oil capacity in the bike. Have any of you experimented with adding an auxilliary oil tank to your WR? I've seen some posts where Indy added an oil cooler to his bike, but it doesn't really add that much oil (6 oz if I remember right). Am I right in assuming that if I can increase the oil capacity, then I can increase my oil-change intervals as well? Can anyone see problems with increasing the oil capacity that much? Thanks in advance EDIT: I'm talking about adding an auxilliary oil tank to the system, not just dumping 2 liters of oil in at the next oil change. I didn't make myself very clear in my description, evidently.