Did you restrict the motion of your lower mounts at all? Like this?
>formatting linkNo I did not.
> If not then yes they do fail pretty quickly in manual trans cars. The
> use of stiffer aftermarket urethane bushings in the upper torque bracket
> also helps to reduce the engine rocking (and subsequent lower hydraulic
> mount failures) at the expense of a bit more engine vibration being
> felt, mostly at idle.
I doubt very much that the original (OE) mounts would have failed within
16,000km (10,000mi). I conclude that the Scan-Tech parts of inferior quality.