Cat TDTO is developed, tested and approved by Caterpillar to meet the same high standards as all genuine Cat parts. Used as standard factory-fill for Cat machine compartments where TO-4 oils are specified. Prolongs clutch disc life up to 45%. Ensures long life and excellent performance for gears, bearings and friction disc material. Engineered as an integral part of Cat power shift transmissions, most wet brake compartments, and Hydrostatic Systems.