CVTF

CVTF stands for Continuously Variable Transmission Fluid, a specialized lubricant and hydraulic fluid used in continuously variable transmissions (CVTs). Its primary roles are to lubricate moving components, cool the transmission, transfer hydraulic pressure, and provide a controlled friction interface between the belt or chain and the pulley surfaces to enable smooth and continuous changes in gear ratios.

Most CVTFs are synthetic-based with carefully balanced friction modifiers and additives. They may be ester- or hydrocarbon-based and are designed to maintain stable viscosity and friction characteristics across a wide temperature range and during high-shear operation. This distinguishes CVTF from conventional automatic transmission fluids, as CVTF must support the unique belt/pulley physics of CVTs.

Operational considerations: The fluid's viscosity behavior under shear must support the CVT's variable ratio mechanism, avoiding belt slip and minimizing wear. It also provides hydraulic pressure for pulley clamping and smooth control of ratio changes. Thermal stability, oxidation resistance, and anti-foam performance are important to prevent fluid degradation and foaming in continuous operation.

Maintenance and compatibility: CVTF formulations are generally not interchangeable with regular ATF, and even among CVTFs, using the wrong specification can degrade performance or shorten life. Vehicle manufacturers specify a particular CVTF by viscosity grade and friction characteristics. Many CVTs offer service intervals for CVTF replacement, though some models claim lifetime fill; in practice, owners should follow the manufacturer's schedule and have the fluid checked if the vehicle experiences abnormal shifting, slipping, or overheating.

See also: Continuously variable transmission, automatic transmission fluid.