I've noticed my clutch slipping on my 05'SE when shifting hard at higher speeds. I've been reading threads for about the past hour and some say it should due to the slipper clutch. I tried Amsoil 20W50 synthetic to see if this would help, but it still does it now and then. One question I have is: did this model come with a slipper, and is there any way to find out other than disassembly. I am going to change the hydraulic fluid in the system today and re-bleed to see if this helps.