Diesel Engine The engine of the M108S has been redesigned and reengineered. Of course, it boasts the same durability and quality you’ve come to expect from Kubota E-CDIS diesel engines. But, this new turbocharged engine is now cleaner than ever before and offers higher torque and incredible pulling power. We’ve increased horsepower to 108 HP, and PTO power to 97HP. These are big changes for a big tractor, and ones you’ll certainly observe out in the field.