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TDTO (CAT TO-4) vs. UTTO: Which One Is Right for Your Equipment?

TDTO (CAT TO-4) oils should not be confused with Universal Tractor Transmission Oil (UTTO). While both TO-4 and UTTO fluids are designed for wet brake applications, they are not interchangeable due to significant differences in their physical and chemical properties, particularly in terms of friction and viscosity.

TDTO oils are specifically formulated to meet the performance requirements of Caterpillar and Allison Powershift transmissions. They provide superior friction performance, extend equipment lifespan, reduce downtime, and optimize overall performance. Their advanced additive technology minimizes wear and ensures reliable operation under extreme conditions, including high temperatures and heavy loads.

The equipment that requires TDTO oil — such as large construction machinery — is typically much heavier than agricultural equipment. These machines demand a higher coefficient of friction to maintain safe braking performance, especially on steep downhill grades, such as those encountered in quarry operations.

Using the wrong wet brake fluid can severely impact braking performance and lead to dangerous consequences. If UTTO is used where TDTO fluid is required, braking efficiency will decrease, resulting in longer stopping distances. Conversely, using TDTO where UTTO is recommended can cause severe brake vibration, excessive wear, and potential component failure.

When selecting a TO-4 level oil for your equipment, always follow the manufacturer’s recommendations. For example, SUNOCO TO-4 TRANSFLUID 10W Transmission-Hydraulic Oil is specifically designed to meet these demanding requirements.