We have EIGHT CASES of Motul DOT 5.1 that we need to go away to make room for new bikes! 5.1 is compatible with your DOT 3&4 fluids and systems, but to gain the full advantage of the much higher boiling point it's best to flush your brake system with it...Which you're already doing annually anyway, RIGHT?!? If you're a brake abuser, this is the stuff to use, it will lessen the possibility of heat-induced lockups. Retail is $10.95 a bottle, the special deal price is $7.50 a bottle until it's all gone. Shipping is tough on this, being a corrosive liquid: It costs $14 to ship one bottle to Texas, and $23 to ship a case (I picked TX as a random middle-of-the-country sample - shipping from here in Salem to Portland is only $6 less). So we'd rather not ship it so you can get a deal...But if you're getting a case it averages out ok-ish. Give us a call at the shop toll free 888-806-1153 and ask for the Doublex brake fluid deal!