eMobility Driveline Solutions

Hybrid and EV transmission applications including ETF, hDCTF, hATF and hCVTF

Electrification is clearly the area of development for transmission-based additives. The transmission may include electric motors being directly lubricated. Existing properties remain essential, such as gear protection and corrosion prevention, but it’s the new properties that will shape the formulating style for electric transmission fluids (ETF) in electric and hybrid vehicles. Afton Chemical has a strong legacy in transmission eMobility with positions in some of the first hybrid systems and major BEV makers that have popularised those vehicles.

Afton Chemical is collaborating with customers across the world to deliver new technology for new OEM hardware and aftermarket solutions, helping oil companies and OEMs to lead in eVolving lubrication.

We believe that with shorter development timelines for electrified drivetrains, our approach is more critical than ever, as we work together to enable new hardware and reduce risks for pioneering OEMs. New performance requirements need new technology to be developed in tandem with hardware. New testing methods, relevant to the application in development, are also in demand.

Electrical Properties

Electrical properties become important when directly cooling eMotors. The lubricant needs to act as an insulator, while not allowing static to build. It also needs to be compatible with coatings and not attack conduction metals to prevent electrified parts becoming damaged. Electrical properties must be considered too for user safety, reliable operation and efficiency of the transmission. These properties need to be maintained over the service life of the fluid. This requires good oxidative stability and the prevention of contamination from wear metals or ingress through the seals.

Cooling Ability

Cooling of eMotors by the lubricant results in much higher maximum temperatures for the lubricant. An important new role will be to take that heat away from the eMotor in the most effective and efficient way. This requires high heat capacity and thermal conductivity. The fluid also needs to be able to withstand these temperatures, requiring greater oxidation stability. All of this in a demanding high-speed environment.


As the system is electrified, the number of electrical parts and electronic controls increases. The metals used in these systems, such as copper, tin and silver can be vulnerable to corrosion. The chemistry used to protect gears and bearings can cause problems for these metals, requiring a careful and balanced approach to additive formulating. New plastics and coatings are being used in critical functions in eMotors and must also be protected.

New fluids are required for passenger car, heavy commercial vehicle and Off Road applications.

Click here to find out about our latest ETF additive pack, HiTEC® 35701. The world's first complete eAxle Additive.