Tractor test: Massey Ferguson 6475 Dyna-6 Six cylinders versus four – that old tractor chestnut. Two years after testing Massey Ferguson’s four-pot 6470 model, we return to the red brand’s 125-135hp mid-line product offering with this detailed test review of the six-cylinder 99kW/135hp (ISO 14396) 6475 Dyna-6. Do those extra couple of engine cylinders make a discernible difference? We assess the various pros and cons