Why Mitsui Chemicals' Lucant hydrocarbon fluid quietly shapes modern engines

Mitsui Chemicals' synthetic hydrocarbon fluid Lucant is invisible to drivers but crucial for engineers, helping cut friction and CO? emissions in automatic transmissions and electric drivetrains. What the specialty lubricant really delivers - and where its limits lie.

Reviewed: ad hoc news Accessory & Components desk. Edited and checked on 2026-06-17, 14:05. Details in the imprint.

Lucant synthetic hydrocarbon fluid is one of those Mitsui Chemicals products most drivers will never hear about, yet it is working hard in the dark belly of modern gearboxes. Engineers pour it into automatic transmissions and e-axles to squeeze out a few precious grams of CO? and a little more smoothness.

What Lucant actually is

Lucant is a family of synthetic hydrocarbon fluids and waxes that Mitsui Chemicals positions as high-viscosity, low-volatility base oils for automotive and industrial lubricants. The official Lucant product page describes them as non-crystalline polyolefin fluids designed for energy-saving lubricants and greases. Chemically, they are tailor-made polymers rather than mineral oil fractions, which gives Mitsui more control over viscosity and temperature behavior.

On paper, the Lucant range covers several viscosity grades, from relatively light fluids for fuel-efficient automatic transmissions to thicker grades that act almost like a liquid polymer. That flexibility lets formulators dial in exactly how an ATF or e-axle oil should flow at -40 °C and at motorway temperatures alike.

How it changes the driving feel

In a modern automatic transmission, Lucant is not a consumer-facing brand but a component inside the fluid recipe that OEMs badge under their own labels. The effect is subtle: shifts feel a little smoother, drag is a touch lower, fuel consumption drops by tenths rather than liters.

Mitsui Chemicals highlights in its technical material that using Lucant as a viscosity index improver can cut internal friction losses in transmissions and axles, which translates into measurable CO? reductions for carmakers chasing fleet targets. The company points to data showing improved fuel economy in automatic transmissions versus conventional mineral-oil-based formulations. For EVs, less churning loss in the e-axle directly means a few extra kilometers of range.

Strengths in the lab and the field

One of Lucant's big advantages is shear stability. Where many viscosity modifiers break down under the brutal shearing in a gearbox, Lucant's polymer backbone is designed to hold its structure longer, so the oil keeps its specified viscosity over more kilometers.

Mitsui also emphasizes the low volatility of Lucant, which helps reduce oil evaporation at high temperatures. In application notes, the company shows lower oil consumption and stable film thickness compared with conventional base stocks in transmission and industrial gear oils. For fleet operators, that can mean longer drain intervals and fewer top-ups, which is quietly attractive on the cost side.

Where Lucant meets its limits

Lucant is not a magic bullet. It is a functional ingredient in a formulation that still needs detergents, anti-wear additives, corrosion inhibitors and friction modifiers from other suppliers. If those are poorly chosen, even a premium base fluid will not rescue a bad oil.

Cost is another quiet constraint. Tailor-made synthetic polyolefin fluids typically cost more than conventional Group III mineral oils. For budget passenger cars in cost-sensitive markets, some OEMs may still decide that a more basic ATF is “good enough” and save Mitsui's premium option for higher-margin models.

Market position and competition

In the narrow world of high-end viscosity modifiers and synthetic base fluids, Lucant competes with specialty products from global oil majors and chemical peers. The battleground is not retail shelves but technical meetings with transmission engineers and lubricant formulators.

Mitsui Chemicals reports in its mobility materials strategy that advanced lubricant components, including Lucant, are part of its growth portfolio alongside performance elastomers and lightweighting resins. That is a pragmatic bet that as drivetrains electrify, friction reduction and thermal control in compact e-axles will stay critical rather than disappear.

How and where it is available

Lucant is sold B2B rather than in small bottles at DIY chains. Typical customers are global lubricant manufacturers, transmission makers and automotive OEMs that incorporate the fluid into their own branded oils for factory fill and service.

Production and technical support are centered in Japan and other Asian hubs, but Mitsui Chemicals promotes Lucant as a global product used in North America, Europe and Asia in automatic transmissions, continuously variable transmissions, dual-clutch units and EV drive systems. Drivers, however, usually only see the effect indirectly via fuel economy labels and OEM oil specifications.

Company context and stock reference

Lucant sits in Mitsui Chemicals' mobility materials segment, next to specialty polymers, elastomers and resins that target lighter, more efficient vehicles across combustion and electric platforms. The product's focus on efficiency fits the group's stated strategy of expanding high-value-added specialty materials in growth markets.

Shares of Mitsui Chemicals (JP3407800006) trade on the Tokyo Stock Exchange in Japanese yen.

Key facts about Lucant

• Product: Lucant synthetic hydrocarbon fluid
• Manufacturer: Mitsui Chemicals Inc.
• Category: Accessory/Spare part - lubricant component
• Launch: Early 2000s, expanded lineup over time
• RRP / Price: B2B pricing on request, depends on grade and volume
• Availability: Global B2B sales via Mitsui Chemicals and lubricant partners
• Target group: Lubricant formulators, transmission and axle manufacturers, automotive OEMs
• Highlight / USP: High-viscosity, low-volatility synthetic polyolefin fluid that improves fuel economy and shear stability in transmissions and e-axles

This article was AI-assisted and editorially reviewed. Product information without guarantee; prices and availability may change at short notice. No investment advice, no buy or sell recommendation. Stock-market transactions involve risks up to total loss.