Trending · Trend
EV Fluids in India 2026: e-Grease, e-Transmission and Battery Coolants
ICE engine oil volume will keep growing into the 2030s, but OEM RFQs are already asking for e-transmission fluids, dielectric coolants and polyurea e-greases. These are three different formulations. A 5W-30 with a new label is not an EV fluid.
Direct answer
ICE engine oil volume will keep growing into the 2030s, but OEM RFQs are already asking for e-transmission fluids, dielectric coolants and polyurea e-greases. These are three different formulations. A 5W-30 with a new label is not an EV fluid.
- ICE engine oil volume will keep growing into the 2030s, but OEM RFQs are already asking for e-transmission fluids, dielectric coolants and polyurea e-greases.
- What Castrol, Gulf and Tata have already commercialised.
- e-transmission vs ATF — copper corrosion, conductivity, foam.
- Immersion / dielectric coolants vs glycol.
- Business Standard (Aug 2025) made this mainstream in India.
What Castrol, Gulf and Tata have already commercialised
While internal combustion engine (ICE) oil volumes will continue to grow in India well into the 2030s, the technological frontier has definitively shifted. Major players like Castrol, Gulf, and Tata have already commercialized dedicated Electric Vehicle (EV) fluid portfolios, heavily publicized since mainstream coverage by Business Standard in late 2025. These product lines are not merely rebranded legacy oils; they represent a fundamental shift in tribological engineering. OEM Requests for Quotation (RFQs) are now explicitly demanding e-transmission fluids, dielectric battery coolants, and specialized polyurea e-greases.
At Lubechem Insights, an independent New Delhi formulation consultancy founded by Er. Manoj Kumar in 2010, we stress that slapping a new label on a conventional 5W-30 engine oil or a standard ATF does not create an EV fluid. The operating environments—characterized by high electrical voltages, extreme rotational speeds, and the presence of sensitive copper components—require entirely new additive architectures and base oil selections. We do not manufacture finished goods, but we provide the independent R&D necessary for Indian blenders to develop proprietary formulations that can compete with these multinational offerings, ensuring they are not left behind in the rapidly evolving EV ecosystem.
e-transmission vs ATF — copper corrosion, conductivity, foam
The transmission in an EV is fundamentally different from a traditional automatic transmission. EV reducers operate at exceptionally high speeds, often exceeding 15,000 RPM, and are frequently integrated directly with the electric motor. This integration means the e-transmission fluid is in direct contact with the motor's copper windings and electrical sensors. Therefore, an e-transmission fluid must possess highly specific electrical conductivity; it must be insulating enough to prevent short circuits, but conductive enough to dissipate static charge. Standard ATFs often fail this delicate balance.
Furthermore, copper corrosion is a critical failure mode. Traditional sulfur-phosphorus EP additives used in ATFs are highly aggressive towards copper at elevated temperatures. EV fluids require advanced, ashless, or highly passivated additive packages to pass stringent copper strip tests (ASTM D130) and wire corrosion tests. Finally, the extreme rotational speeds induce severe aeration and foaming. A robust e-transmission fluid requires a highly specialized anti-foam system to maintain a continuous lubricating film and prevent cavitation. Formulating for these three parameters—conductivity, copper compatibility, and foam suppression—is the core challenge in developing a true e-transmission fluid.
Immersion / dielectric coolants vs glycol
Thermal management is the most critical factor in EV battery performance, longevity, and safety. Traditional indirect cooling systems rely on water-glycol mixtures circulating through cold plates. However, as OEMs push for ultra-fast charging and higher power densities, the industry is moving towards direct immersion cooling. In this architecture, the battery cells are completely submerged in a dielectric fluid. This fluid must possess exceptional thermal conductivity and specific heat capacity to rapidly absorb and dissipate heat, preventing thermal runaway.
Crucially, unlike water-glycol, immersion coolants must be completely electrically insulating (dielectric) to prevent short-circuiting the submerged battery cells. These fluids are typically ultra-low viscosity synthetic hydrocarbons (like specific PAO cuts) or engineered fluorinated fluids. They must also exhibit excellent material compatibility with the battery casings, adhesives, and sealants. At Lubechem, we assist clients in navigating the complex formulation requirements for dielectric coolants, focusing on balancing thermal transfer efficiency with absolute electrical safety and long-term oxidative stability, ensuring the fluid performs flawlessly over the life of the battery pack.
e-grease and polyurea noise damping
The bearings in EV motors face a unique set of challenges: they run hotter, faster, and must operate almost silently compared to ICE hub bearings. Furthermore, they are subjected to electrical currents that can cause pitting and fluting on the raceways. Traditional lithium complex greases struggle to meet these combined demands. The industry standard for EV motor bearings is rapidly becoming polyurea grease formulated with synthetic base oils (PAO or esters). Polyurea thickeners inherently lack metallic ions, providing a more stable and controllable dielectric profile.
Moreover, polyurea greases excel in noise damping. Because EV cabins lack the masking noise of an internal combustion engine, any bearing whine is immediately noticeable and unacceptable to the consumer. The smooth, non-fibrous structure of polyurea provides a uniform lubricating film that significantly reduces acoustic emissions. As detailed in our dedicated polyurea e-grease article, formulating these products requires meticulous attention to high-temperature bleed, shear stability, and electrical resistivity. We utilize rigorous bench testing, including DIN 51821 (FE9) for bearing life, to ensure the formulation meets the exacting standards of modern EV OEMs.
A realistic first EV SKU for an Indian blender
For an independent Indian lubricant blender looking to enter the EV market, attempting to launch a full portfolio simultaneously is highly risky. The R&D costs and testing requirements are substantial. We advise clients to start with a realistic, high-demand first SKU: a dedicated e-transmission/reducer fluid for the two-wheeler and three-wheeler market. This segment is electrifying rapidly in India, and the technical barriers to entry are slightly lower than those for high-voltage passenger car immersion coolants.
A well-formulated e-transmission fluid for a two-wheeler needs to provide excellent gear protection, superior copper compatibility, and optimized frictional properties for efficiency. By focusing on this specific application, a blender can establish their EV credentials, validate their supply chain for specialized additives, and begin generating revenue in the EV sector. Once this foundational product is successful, the portfolio can be strategically expanded into polyurea e-greases and eventually dielectric coolants. Lubechem provides the targeted formulation expertise to ensure this first SKU is technically robust and commercially viable.
Independent R&D for the 2026 EV landscape
The EV fluid market in 2026 is driven by rapid technological iteration. Relying on generic, off-the-shelf additive packages will not suffice to win OEM approvals. Independent R&D is essential. At Lubechem Insights, we treat academic papers and patents as prior art, extracting the fundamental tribological principles to engineer unique, unencumbered formulations. We do not invent clients or claim false certifications; our value lies in delivering scalable, scientifically sound chemical architectures.
Whether you are developing a low-conductivity e-grease, a highly passivated e-transmission fluid, or a next-generation dielectric coolant, the formulation must be built from the ground up to address the specific electrical, thermal, and mechanical stresses of the EV environment. By partnering with an independent consultancy, Indian manufacturers can access the specialized knowledge required to compete in this high-tech landscape, ensuring their product offerings are not just relevant for today, but engineered for the demands of the future EV ecosystem.
EV Fluid Categories and Key Performance Metrics
| Fluid Type | Primary Function | Critical Formulation Challenge |
|---|---|---|
| e-Transmission Fluid | Gear protection and motor cooling | Balancing electrical conductivity with copper corrosion protection |
| Dielectric Coolant | Direct immersion battery thermal management | Maximizing heat transfer while maintaining absolute electrical insulation |
| e-Grease (Polyurea) | High-speed motor bearing lubrication | Noise damping, low high-temperature bleed, and arcing prevention |
People-first note: this is dated editorial for decision-making. It is not a scaled rewrite of the manufacturing pages, and it is not legal or certification advice.
Questions plants actually ask
Can we relabel 5W-30 as an e-transmission fluid?
No. e-transmission fluids are judged on copper corrosion, electrical conductivity, foam and gear/bearing duty that engine oil was not designed for. A new label does not change those tests.
Are dielectric coolant and glycol engine coolant interchangeable?
No. Immersion dielectric fluids are insulating oils with oxidation, compatibility and flash constraints. Glycol water-based coolants are a different materials set. Do not mix the RFQs.
Where does polyurea e-grease sit in a first EV SKU list?
Usually after you know whether the customer is buying a motor-bearing grease, a coolant or a gearbox fluid. They are three formulas. Noise, bleed and resistivity belong on the grease brief only.
Has Lubechem already qualified a named OEM e-fluid?
This page does not invent OEM approvals. Send the RFQ, the copper/conductivity targets and the duty. Formulation support is documentation and bench work, not a borrowed licence.
Literature and prior art
Citations below are orientation, not a freedom-to-operate opinion. Lubechem does not copy claimed compositions and does not treat a patent as a product endorsement.
- ASTM D130 — Standard Test Method for Corrosiveness to Copper from Petroleum Products
- DIN 51821 (FE9) — Testing of lubricants - Test using the FAG rolling bearing grease testing machine FE9
- Business Standard (Aug 2025) — Coverage of multinational EV fluid launches in the Indian market