I heard that double clutching is supposed to reduce wear on your manual transmission's synchros and make it easier to slide into gear on downshifts, so I practice doing it on my '87 bmw 325e with 225k miles on it. I figure with that many miles, the synchros could use any kind of break you give them. The problem is that I cannot tell the difference in the amount of force I need to downshift between double clutching and not double clutching. To double clutch, I depress the clutch, put in neutral, blip the throttle to about 2k rpm, depress the clutch again, and downshift. Am I doing something wrong?