why does it matter that you completely flush the system twice? when I switched to the motul I did the usual start from the furthest wheel and work in, then went back once i finished and did the two back wheels again... That pretty much gets out all of the old fluid and you don't have to do two system flushes. From the tests I've seen, motul rbf600 is the best stuff besides castrol SRF... i thought i read a few months back about something like an rbf660, but havent seen it for sale anywhere.