CVT Fluid Specifications Beyond Nissan NS-2/NS-3: What Honda, Subaru, Mitsubishi and Hyundai Actually Specify
Last verified: 2026-07-29
Suppose a workshop reports a CVT that shudders under light acceleration — the revs climb, road speed lags a beat behind, then the drive catches again with a jolt. The technician checks the reservoir, finds a fluid whose label carries the right badge and a plausible-sounding code, and reasonably assumes the job is closed. It might not be. Nissan’s NS-2 and NS-3 designations are covered in full, with the friction mechanism behind them, in our transmission fluid specifications guide — but four other manufacturers running CVTs in daily service specify their own designations too: Honda, Hyundai, Mitsubishi and Subaru. None of the four publishes theirs on anything resembling engine oil’s public licensing system. The badge on the vehicle is not the specification. The transmission unit is, and the only way to know which fluid a given unit requires is to read the manufacturer’s own document, never the drum label.
Why does a CVT fluid code look official but check out nowhere?
Engine oil trained buyers to expect that a spec name is checkable. An API service category comes with a licence number, and anyone can search API’s own directory to confirm a specific product actually holds it. That habit transfers badly to CVT fluid.
A designation like CVTF-J4 or HCF-2 sits on a data sheet in the same typeface as a licensed API category — and on every avenue checked for this article, it is verifiable nowhere with the same independence.
Three avenues were checked directly. The API engine-oil licensing system’s scope is engine oil, full stop — its own governing publication defines the programme as one for engine oil performance, and it does not extend to automatic-transmission or CVT fluid. The Japanese on-file registration scheme administered by JALOS covers automotive gasoline engine oil, automotive diesel engine oil, and motorcycle two- and four-stroke engine oils; no CVT or ATF registration category appears in its published scope. And each manufacturer’s own consumer-facing fluid page states a designation as a fact about that manufacturer’s own product line, not as an entry in any third-party register a buyer could cross-check independently.
A named, published test method for the property that actually matters here does exist — JASO M358, “Standard test method for metal on metal friction characteristics of belt CVT fluids” — but it is a test method, not a licensing category. There is no companion public directory of products tested under it the way there is for API engine oil categories.
Put plainly: every avenue checked came back empty. Not “no register exists anywhere in the world” — that is a claim no amount of searching can prove — but the specific, named places a buyer would look for engine oil simply do not extend to CVT fluid. A specification you cannot look up is still a specification. It just puts the entire burden of proof on the paperwork sitting in front of you.
What does the transmission actually need from the fluid?
Belt and chain CVTs move torque entirely through friction between steel belt or chain elements and steel pulley sheaves — there is no gear-tooth mesh doing the work — so the fluid has to sustain a high, stable metal-on-metal friction coefficient at exactly that interface, or the belt slips (SAE Technical Paper 2012-01-1670, “Development of Next-Generation Continuously Variable Transmission Fluid Technology”, SAE International, 2012). That is close to the opposite of what a conventional ATF is formulated to do at its clutch packs, which is why the two are not interchangeable; the full mechanism, and how it plays out in Nissan’s NS-2/NS-3 pair, is set out in the parent guide. What matters for sourcing is the consequence: because the requirement belongs to the hardware at that interface, the designation follows the transmission unit and not the vehicle it happens to be bolted into.
Which designation does each manufacturer actually specify?
Honda is the simplest case in the set. Its owner’s-manual portal names HCF-2 across multiple current model lines. It functions as a manufacturer’s own branded service fluid rather than an open published specification with a requirements table a third party can formulate against and be measured on — no licensing programme, no third-party registry. Honda’s own consumer-facing text states that damage traced to a non-equivalent fluid falls outside its new-vehicle limited warranty. That is a warranty-liability statement, not a certification mechanism, and the rest of this ladder depends on holding the two apart.
Hyundai’s owner’s-manual portal names SP-CVT1 in a current-generation model’s maintenance and fluid-capacity table. The designation is shared across the wider Hyundai Motor Group: Kia’s own technical service bulletin for its IVT-equipped models specifies the identical designation for the group’s shared transmissions. Two separate companies’ own technical bulletins naming the same fluid is materially stronger evidence than a shared parts catalogue — though neither document states in so many words that its fluid is the same as the other’s. No public register stands behind either.
Mitsubishi’s case rests on the strongest primary document in the set, and it carries the sharpest correction. The manufacturer’s own technical service bulletin specifies genuine CVTF-J4 fluid by name for a named CVT unit family across a range of model years and models. That bulletin makes no mention of an earlier J1 fluid and states no supersession relationship whatsoever. The claim that “J4 supersedes J1”, repeated confidently across parts-reseller listings and owner forums, does not appear in the manufacturer’s own document. On a supplier’s data sheet this reads as settled fact when it is, at best, trade-circulated shorthand.
Subaru is the widest case, and the one most buyers underestimate. The manufacturer’s own recurring powertrain-fluids service bulletin — revised repeatedly, and carrying a revision issued in the current year — lists four CVT fluid designations in active use, not three. CVTF II (green) covers the TR580-code Lineartronic transmission in naturally aspirated models other than the H6. High Torque CVTF covers the TR690 code in Forester Turbo and in Legacy, Outback H6 and WRX models from specified years. CVTF III (orange) covers the TR580 code in 2.5-litre naturally aspirated Legacy and Outback models and in later Crosstrek and Forester Wilderness. CVTF LV covers the TR690 code in Ascent and in 2.4-litre turbocharged Legacy and Outback models.
Read the pattern rather than the list. Every entry is tied to a transmission code and a drivetrain, never to a nameplate — which is why the same badge appears against more than one fluid. The bulletin does not describe CVTF LV as superseding High Torque CVTF or anything else; on the document’s own evidence the two coexist, each covering different applications on the same TR690 code. The commonly repeated line that Subaru uses three CVT fluids undercounts what the manufacturer’s own bulletin currently lists.
Does a badge decide the fluid, or does the transmission?
There is no single answer to “which CVT fluid does this vehicle take” — that is the finding, not a hedge. Three variables decide it: the transmission unit’s own code, the model year that unit was fitted, and, where a manufacturer runs concurrent designations, which of them covers that particular code.
Subaru’s bulletin is the clearest documented case, because the TR580 and TR690 codes carry different fluid designations across overlapping model years of the same nameplates. Applies to CVT fluid specifically, not to a conventional stepped automatic, where a single designation more often covers a whole model range.
And all four manufacturers are silent on the question a buyer most wants answered. None of the documents checked states whether a newer designation may be used in a unit originally filled with an older one, or the reverse. Silence is not permission.
Specify the transmission unit code, never the model badge, and require the fluid to be matched against it in writing.
How does “meets the requirement” differ from “genuine and licensed”?
A “multi-vehicle” or “universal” CVT fluid claim asserts that the product satisfies the performance requirements associated with a list of manufacturer designations, in the supplier’s own testing or formulation judgement. It does not assert that any manufacturer reviewed, licensed or approved that specific product. Both claims can sit on the same page in the same typeface, and the obligation each one creates is set out in our guide to “meets specification” versus OEM approval.
What is actually checkable on a supplier’s document is narrower than the language around it. Which designations, and which transmission unit families, are named specifically. Kinematic viscosity at 40 °C and 100 °C plus low-temperature Brookfield viscosity, set against whatever figures the manufacturer itself publishes. Whether the document cites a named standardised friction test method — JASO M358, for instance — or only asserts “anti-slip” or “anti-shudder” performance in prose, a distinction that matters because friction and shudder behaviour are measured by defined test methods rather than described. And whether the document draws its own line between “meets the requirements of” and “genuine”, or blends the two into one sentence.
Require the document to draw that line itself. If it does not, ask why.
What should a buyer require in writing before ordering?
The checklist below is built to be forwarded on its own — its scope is stated on it, and it does not depend on the paragraphs around it.
| Ask the supplier’s document this | A compliant answer looks like |
|---|---|
| Which manufacturer designation, exactly? | The full code named — CVTF-J4, HCF-2, SP-CVT1, CVTF III — not a generic “CVT fluid” label |
| Which transmission unit or code is it formulated for? | A named transmission family or code, not a vehicle model or badge |
| What are the KV40, KV100 and low-temperature Brookfield values? | Figures stated outright, comparable against the manufacturer’s own published values |
| Does it cite a named friction test method? | A specific standard named — JASO M358, for instance — not “anti-shudder” asserted in prose alone |
| Does it distinguish “meets the requirements of” from “genuine”? | The document states the difference explicitly, rather than folding both into one claim |
Applies to CVT fluid documentation specifically — not to ATF, not to engine oil, and not to a general lubricant data sheet.
Not one of those five questions asks the reader to trust a marketing sentence. Each has an answer that can be measured, requested, or specified in writing before an order is placed. An RFQ that carries this set — designation, transmission code, viscosity figures, cited test method, and the “meets” versus “genuine” distinction stated plainly — gives a supplier a specific document to answer against rather than a badge to guess from. On the Altonex Global platform the transmission fluids category is where those suppliers are found; the specification set above is what should travel with the request.
This article is general technical information for buyers and specifiers. It is not a recommendation of any product, and Altonex Global does not test, inspect, certify or approve any lubricant or supplier claim.