When Case IH introduced the 99kW/135hp MX135 back in 1997, most overlooked the fact that it was broadly based upon the proven mechanicals of the outgoing ‘square-jawed’ 132hp Maxxum Pro 5150. As it turned out, the MX sold well, right up until it ceased production late last year, and today makes a strong case for itself as a used buy. James de Havilland digs deeper