Castrol GPS

GUIDE TO HEAVY DUTY PRODUCTS AND SERVICES

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1 800 255 4417 www.castrol.com/GPS Transmission Fluids Background & Properties Important Transmission Fluid Properties July 2017 Automatic Transmission Fluids (ATFs) ATFs must be able to hold loads and encourage smooth shifts. Therefore, ATFs have a high dynamic coefficient of friction with a moderate static coefficient of friction. ATFs do contain friction modifiers, which translate to moderate static friction to avoid harsh shifts. Automatic Transmission Fluids Sliding Speed Decreasing Torque, Nm TES-389 TO-4 Fluids The most dramatic friction characteristics are found in the TO-4 fluids for powershift transmissions. TO-4 fluids have the highest static coefficient of friction for fast lock-up and outstanding holding capacity. The chart depicts this fact with its sharp upward point illustrating a tight, firm lock-up. Powershift Transmission Fluids Sliding Speed Decreasing Torque, Nm TO-4 D 4

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