Hydraulic/Transmission Oil (TO-4) is a heavy-duty, multi-functional powertrain fluid specifically engineered to meet the performance standards of Caterpillar’s TO-4 specification. Designed for use in transmissions, final drives, wet brakes, and hydraulic systems, TO-4 fluids provide enhanced wear protection, improved friction control, and superior thermal stability under severe operating conditions. These oils are formulated with high-quality base stocks and carefully balanced additive systems to deliver consistent performance in high-load, high-temperature environments common in construction, mining, and heavy-duty off-road equipment.
TO-4 fluids ensure precise clutch engagement, reduced brake chatter, and extended component life in equipment that operates under extreme pressure and continuous use. They are non-friction-modified, making them ideal for systems where transmission and hydraulic functions are integrated. These oils are backward-compatible with older Caterpillar TO-2 systems and meet requirements for Komatsu, Allison C-4, and other off-road OEMs.
Available TO-4 Oil Grades and Their Applications:
10W TO-4 Transmission Oil – Designed for cold climates or shared hydraulic/transmission systems where lower viscosity ensures smooth startup and fast circulation.
30 TO-4 Transmission Oil – The most common grade, ideal for transmissions, torque converters, and hydraulic systems in moderate to high-temperature operating conditions.
50 TO-4 Final Drive Oil – A higher viscosity fluid suited for final drives, heavy-duty transmissions, and differentials operating under severe loads.
60 TO-4 Drive Train Oil – The thickest TO-4 grade, used in extremely heavy-duty applications such as large mining equipment or where OEMs require high-viscosity powertrain fluids.
These TO-4 oils are recommended for use in equipment from manufacturers such as Caterpillar, Komatsu, Allison, John Deere, and Volvo, and are commonly used in dozers, scrapers, wheel loaders, haul trucks, excavators, and other off-highway machinery.
Packaging Options:
5-gallon pails – Perfect for service trucks or small-scale repairs
55-gallon drums – Ideal for maintenance shops and daily operations
275-gallon totes – Bulk supply for fleets and high-volume users
Whether you’re maintaining a fleet of construction equipment or servicing mining vehicles in the field, our TO-4 hydraulic/transmission oils provide maximum protection and performance. Choose from TO-4 10W, 30W, 50, or 60 grades to match your OEM requirements and operating conditions.
