They are obviously clueless !!! Ask them what rpm the Lift is engaged. Below are some extracts from the SAE paper on the developement of the 2ZZ-GE : At engine speeds below 6000rpm, the rocker arm moves according to the low lift roller follower. When engine speed is above 6000rpm, hydraulic pressure is applied to the locking pin, which slides under and locks the high lift slipper follower to the rocker arm. This creates the difference in valve lift, for the rocker arm will now move according to the high lift slipper. When engine speed is below 6000rpm, the return spring pushes the locking pin back, and the high lift slipper is freed. Max Power 135kw/7600rpm Max Torque 180Nm/6800rpm Think you should be demanding a full refund on the vehicle to be honest.