Does the new one feel stiffer when you work the cylinder back and forth compared to the leaky one?
Does it seem to have a better seal?
I recall that the OEM one seemed to be more stiff when rocking it back and forth. The aftermarket one seems to be smoother overall but will that translate to better performance? I have no idea...
As for the better seal, the OEM one seemed to be sealed in place very well. When I pried open the rubber boot using my fingers, I did not see any dirt or anything underneath. I don't plan to open up the new OEM tensioner since I'm afraid I'll spill some of the fluid.