I hate the OEM sachs clutches, because for the M120 they only come in one temp setting, and they don't engage until around 100c. I bought one of those aftermarket clutches even though the original was fine, because I wanted to lower the temps. I installed a 71c t-stat, the cool harness mod, and the aftermarket clutch that engages sooner, and now the car is pegged at around 80c, right where I want it.

I hope my clutch lasts longer than yours.