Some people think that electric vehicles (EVs) require no lubricants since they are not equipped with a combustion engine. It is a myth that doesn’t reflect reality. While battery electric vehicles (BEVs) do not use any engine oil, they require a variety of specialty lubricants and fluids for gears, bearings, motors, batteries, and other parts. Knowing what EVs need enables workshops, distributors and fleet operators to be ready for the maintenance and product changeover.
We know that these are the types of changes that can be difficult to handle, and at YEFE, we partner with organizations that are in the middle of it. As engine oil changes go, the right choice of lubricants and thermal fluids is still vital to performance, efficiency, durability and safety. This guide explains what changes, what remains the same, and why quality solutions that are specific to EV is now more important than ever.
What EVs Eliminate: Engine Oil and Multi-Gear Transmissions
Pure battery electric vehicles are a paradigm change from internal combustion engine (ICE). With no multi-cylinder engine running and burning fuel, then there is no need for service with engine oil and oil filters or for the regular oil change intervals that have long been the hallmark of vehicle service.
A large number of EVs also feature single-speed reduction transmission units instead of complex multi-speed automatic transmission units. This is a streamlining of the many of the typical automatic transmission fluid (ATF) service intervals that are familiar to the service technician.
Why Engine Oil Is Not Needed in a Battery EV
The operation of EV motors is different than combustion engines. They have fewer moving parts with high friction such as pistons, rings and camshafts and generate torque directly via electromagnetic fields. Where many mechanical components once needed regular oil changes, they are now replaced by rolling bearings and electric windings to ensure trouble-free operation.
However, if the motor and drivetrain do not require any lubrication, it does not mean that the engine should not be lubricated. Even neighbouring gears and bearings need protection, but in other forms.
Which Lubricants and Fluids EVs Still Need
All advanced EVs use several systems that require lubricants and fluids. Examples of these include gear oils, specialized greases for bearings and motors, brake fluid and advanced coolants for thermal management. Certain fluids are still basically the same as those used in ICE applications, while others have been developed as specific EV fluids.
Fluids That Stay Similar vs Those That Change
Many chassis greases and brake fluid can remain the same specification, but may be used under somewhat varying conditions. New performance expectations are spurring formulation innovation in the driveline fluids and battery thermal management areas. A lot of early EVs were a good match for current ICE fluids, but the industry is moving toward specially formulated fluids.
Lubricants for EV Gears and E‑Axles
To manage the high rpm of the motors, modern EVs use small e-axles and reduction gearboxes to provide the torque that can be used at the wheels. These units require good lubrication for immediate torque response, high-speed, and thermal loading in confined space.
EV gear oil and e-axle fluid systems need to provide gear and bearing protection when under heavy load, and frequently perform more than one function when a common sump is used to cool the electric motor and power electronics.
Why Conventional Gear Oil Is Not Always Enough
Some problems exist in EVs that can make standard gear oils unsuitable. The fluids used in the e-axle must have excellent electrical compatibility to prevent stray currents, superior copper corrosion protection for windings and busbars, controlled foaming and improved thermal characteristics. This has led to the development of special “e-fluids” engineered for electrified drivetrains.
Greases in EVs: Bearings, Motors and Chassis
In the vehicle, EV motor bearing grease, and greases in general, remain essential throughout the vehicle. There are still many small actuators, steering systems, suspension components and wheel bearings that require high-performance greases.
The fast-running speeds of electric motors lead to higher Lube demands than conventional engines.
EV-Specific Demands on Greases
Traction motor bearings may reach speeds of over 20,000 rpm, and they need to have a low friction formulation that will be stable at high speed and temperature. Requirements for noise, vibration and harshness (NVH) are higher since there is no sound from the engine to buffer mechanical noise. There are also some applications that require high electrical insulation greases.
Coolants and Thermal Management Fluids for Batteries and Power Electronics
One of the most important parts of EV design, and battery life, is battery temperature control. EV battery coolant and thermal management fluid systems maintain cell temperatures in an optimal range when charging, discharging and in changing ambient conditions.
It could be any kind of fluid (or in some designs, direct contact dielectric fluids) that has been advanced with better dielectric characteristics.
Why Battery Temperature Control Depends on the Right Fluids
Temperature variations, even slight ones, may diminish battery capacity, slow charging rates, or possibly speed up degradation. The optimal thermal management fluids are high performance heat transfer fluids that are compatible with high voltage components, seals and plastics. The selection and maintenance of fluids have a direct impact on safety, range and warranties.
Other Fluids EVs Still Use: Brake Fluid and Beyond
Even with regenerative braking, hydraulic systems are still crucial for providing the stopping power and confidence in emergency situations. The system remains protected from moisture and high temperatures with high quality brake fluid.
Additionally, some vehicles still have a small amount of hydraulic fluid in dampers or steering systems that have not been fully electrified. Other fluids—such as windshield washer fluid and HVAC refrigerants—round out the picture of service fluids.
How Regenerative Braking Changes, But Does Not Remove, Brake Fluid Requirements
Regenerative braking will help to slow the wear on brake pads and rotors, but it does not replace the need for new brake fluid. While moisture contamination and boiling point degradation is still possible over time, regular inspection and replacement, per manufacturer guidelines, is necessary.
What Makes EV Lubricants Different from ICE Lubricants?
The main distinction between EV lubricants and ICE lubricants is related to the operating conditions and material compatibility. EV fluids generally aim to be less viscous for efficiency reasons, but provide excellent protection under high torque and electrical stress. They should not corrode, conduct or cause conductivity problems with copper, polymers or electronics.
Industry Trends: From Adapted ICE Fluids to Dedicated EV Fluids
When EVs were being produced in the early days, the transmission, or gear fluid, was often modified to suit an EV. Looking ahead to the future of the market, the big players OEMs and lubricant manufacturers are rolling out specific e-fluids and e-greases designed to meet the needs of electrified powertrains. The efficiency, NVH and service life are the key product characteristics.
Maintenance Implications – Less Frequent, But Still Important
While there are some similarities, EV service is easier in other respects — no more routine oil changes for the engine. But, there are still fluids that need attention. OEM guidelines for e-axle fluid changes, coolant condition monitoring and brake fluid replacement shall be followed by technicians.
How EV Fluids Impact Total Cost of Ownership
The amount of fluid maintenance also goes down, but what fluids are available are more technically challenging. The wrong product or failure to change can result in costly damage to batteries, motors or gearboxes. Fleets can maximize uptime and component warranties by proper fluid selection.
What This Means for Lubricant Distributors and Importers
The growing popularity of EVs will drive a change in lubricant portfolios. While traditional engine oil products may suffer year over year, growth prospects are increasing in the specialized products for EVs. Smart distributors who realize the needs can offer a lot of insight to workshops and fleets entering the EV market.
Building an EV-Ready Product Portfolio
Begin by providing excellent e-axle fluids that satisfy performance specifications, high-speed motor bearing greases, and advanced battery coolants. These products are enhanced with technical training and documentation. Distributors are being expanded on their service capabilities by having access to more relevant gear oils, greases, and coolants from partners such as YEFE, suitable for both existing and new EV applications.
Seeking the right lubricants and fluids always was significant. In the EV age it’s more strategic. This not only eliminates the “EVs need no oil” fallacy, but provides the context for today’s vehicle lubrication, ensuring businesses minimize risk, optimize performance, and seize new market opportunities.
For fleets, distributors, and workshops that are moving towards EV, reach out to the YEFE team for solutions that are right for you.