The 4136 and 4142 are the newest models designed for dairies and feedlots with the latest enhancements to provide a mixer that is reliable, efficient and affordable. Improvements made to the drive system, undercarriage, box construction and weigh bar system have improved serviceability and reliability - However, one fact remains the same, the overall superior mixing performance of this machine has gone unchanged - It is the same genuine Kuhn Knight quality with a new streamlined design.