Steve, I only have the 4 speed. The BG Synchro Shifts works well and should be ok for older cars as I think it doesnt have the sulfur content of the GL5 stuff. Been awhile since I've checked things out. Since the car has last been on the road in 2003 awaiting a paint job, life getting in the way you know. ;-) roland DL650 VX800 #21 P5