RE30 Severe Duty 85W-140 Gear Oil

Some gear oils are designed to meet a specification.

RE30 was designed to survive what happens after the specification has been met.

After almost twelve months of development, KCK Lubricants RE30 Severe Duty 85W-140 Gear Oil has been formulated using carefully selected virgin base stocks, the latest generation extreme pressure additive technology and our proven hot blend manufacturing process. The result is a severe-duty gear oil built to handle enormous load, extreme operating temperatures and the punishment that comes with heavy towing, high torque, off-road use, commercial transport and competition.

For more than 25 years we've built lubricants around one simple philosophy—performance comes from chemistry, not marketing. Every product that carries the KCK name has to earn its place in the range, and RE30 is no exception.

Whether you're towing a heavy caravan across Australia, hauling triple trailers through harsh commercial conditions, driving a modified four-wheel drive, building a high-powered street car or spending weekends at the race track, your differential doesn't know what badge is on the vehicle. It only knows load, heat and pressure.

That's exactly what RE30 was built for.

The SAE 85W-140 viscosity delivers exceptional film strength under severe operating conditions, helping protect hypoid gears, bearings and differential components when shock loading and sustained temperatures begin to push conventional lubricants beyond their limits. Excellent thermal stability and oxidation resistance help maintain performance during extended service, while advanced anti-wear and extreme pressure chemistry continues protecting critical driveline components when it matters most.

RE30 is also Limited Slip compatible, making it suitable for a wide range of limited slip differential applications without requiring additional friction modifier additives in many cases. That versatility makes it an ideal choice for performance vehicles, four-wheel drives, commercial transport, agricultural equipment, mining machinery and industrial applications where maximum protection and long-term reliability are expected.

Like every KCK lubricant, RE30 is manufactured using our hot blend process. This allows the additive system to integrate correctly throughout the lubricant, producing a consistent, stable formulation from the first bottle to the last. Combined with carefully selected virgin base stocks, the result is a gear oil that delivers outstanding protection against wear, corrosion, oxidation, foaming, micropitting and thermal breakdown under the toughest operating conditions Australia can throw at it.

Designed for Australia. Built for Everywhere.

Designed, hot blended and manufactured in Australia using carefully selected virgin base stocks and advanced additive technology.

Every batch of RE30 is produced with the same philosophy that has driven KCK Lubricants for more than 25 years. We don't formulate products simply to meet a specification—we formulate them to perform in the conditions that made those specifications necessary in the first place.

Whether it's a work truck, a four-wheel drive, a weekend cruiser or a dedicated race car, RE30 has been developed to deliver consistent protection when loads are high, temperatures climb and reliability isn't negotiable.

Built for Severe Duty Applications

RE30 Severe Duty 85W-140 Gear Oil is recommended for:

• High performance and modified street vehicles
• Motorsport and competition applications
• Four-wheel drives and touring vehicles
• Heavy towing and caravan applications
• Heavy commercial trucks and transport fleets
• Mining, earthmoving and construction equipment
• Agricultural machinery
• Industrial gear drives
• Limited Slip differentials requiring an LS compatible lubricant
• Hypoid differentials operating under severe load

Performance Specifications

KCK Lubricants RE30 Severe Duty 85W-140 Gear Oil meets or exceeds the performance requirements of:

• API GL-5
• API MT-1
• SAE J2360
• MIL-PRF-2105E
• DAF
• Dana
• Arvin Meritor Axles
• Mack GO-J
• BTR Limited Slip 5M-48
• BTR Limited Slip 5M-50
• GM Limited Slip HN2013
• GM Limited Slip HN2040
• ZF TE-ML 05C
• ZF TE-ML 12C
• ZF TE-ML 12N
• ZF TE-ML 16E
• ZF TE-ML 21C

Frequently Asked Questions

What is RE30 Severe Duty 85W-140 Gear Oil designed for?

RE30 is a premium severe-duty gear oil developed for hypoid differentials, final drives and gear sets operating under extreme load, high temperatures and severe service conditions. It is suitable for performance vehicles, four-wheel drives, heavy commercial transport, agricultural machinery, mining equipment and industrial applications where an SAE 85W-140 lubricant is specified.

Is RE30 suitable for Limited Slip Differentials (LSD)?

Yes. RE30 is LS compatible, making it suitable for many limited slip differential applications without requiring additional friction modifier additives in many applications. Always refer to your vehicle or differential manufacturer's recommendations.

Can I use RE30 for towing?

Absolutely. Heavy towing is one of the environments RE30 was specifically formulated for. Whether you're towing a caravan, horse float, machinery trailer or operating heavy transport, RE30 provides the film strength and extreme pressure protection needed to help protect gears and bearings under sustained load.

Is RE30 suitable for four-wheel drives?

Yes. RE30 is an excellent choice for four-wheel drives operating in harsh Australian conditions including sand, mud, steep climbs, low-range work and long-distance touring where differential temperatures can become extremely high.

Can RE30 be used in motorsport?

Yes. Although RE30 is positioned as a severe-duty gear oil rather than a dedicated race lubricant, it is equally at home in many motorsport applications where high shock loading, extreme torque and elevated operating temperatures demand exceptional gear protection.

What does API GL-5 mean?

API GL-5 is an internationally recognised performance specification for gear lubricants used in heavily loaded hypoid differentials and final drives. RE30 meets or exceeds the API GL-5 performance requirements, providing outstanding protection against wear, scuffing and extreme pressure conditions.

Why choose an SAE 85W-140 gear oil?

An SAE 85W-140 gear oil provides a thicker lubricating film than lighter gear oils, making it ideal for severe-duty applications involving high temperatures, heavy loads, large differentials, towing, commercial transport and extreme off-road use where maximum protection is required.

Why are virgin base stocks important?

Virgin base stocks provide a consistent, high-quality foundation for the lubricant, allowing advanced additive technology to perform as intended. Combined with KCK's hot blend manufacturing process, they help deliver excellent thermal stability, oxidation resistance and long-term protection.

Where is RE30 manufactured?

RE30 is proudly designed, hot blended and manufactured in Australia using carefully selected virgin base stocks and advanced additive technology. Every batch is produced to the same uncompromising standards that have defined KCK Lubricants for more than 25 years.

Anyone can blend a thick gear oil.

Building one that continues protecting gears after hours of towing, climbing, racing, hauling or working in extreme conditions is another thing entirely.

That's why RE30 exists.