ATB & Limited Slip Differential Oil
ATB, limited-slip and locking differential oils for Land Rover axles, from dedicated 75W-90 and 80W-90 LS formulations to Ravenol RHP – our highest-performance differential oil for demanding road, towing, expedition, off-road and competition use.
RHP is the flagship oil in this section, combining a PAO full-synthetic base, Ravenol USVO technology, a viscosity index of 188 and Ravenol’s stated high-load, EP and shear-stability performance. Dedicated LS oils remain important where a plate-type differential requires a particular viscosity and friction behaviour.
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Ravenol RHP – our highest-performance differential oil
Ravenol RHP 75W-90 gives this category a genuine step above conventional differential oil. Developed as a PAO-based fully synthetic racing gear oil with Ravenol USVO technology, it is specifically intended for highly loaded drivetrain use and carries limited-slip characteristics alongside high load-carrying capacity, excellent EP properties, outstanding shear stability and strong thermal stability. Ravenol specifically recommends it for rear axles with integrated locking differentials. :contentReference[oaicite:5]{index=5}
The viscosity data is particularly compelling for a Land Rover axle. RHP measures 92.6 mm²/s at 40°C and 16.1 mm²/s at 100°C, with a viscosity index of 188. It therefore avoids the very heavy cooler viscosity of a traditional mineral 80W-90 while retaining substantial SAE 90 viscosity as the axle becomes hot.
| Property | Ravenol RHP 75W-90 | Ravenol EPX 80W-90 |
|---|---|---|
| Base oil | PAO full synthetic, USVO | Mineral |
| Viscosity at 40°C | 92.6 mm²/s | 130.3 mm²/s |
| Viscosity at 100°C | 16.1 mm²/s | 14.3 mm²/s |
| Viscosity Index | 188 | 108 |
| Pour point | -57°C | -33°C |
RHP is considerably less viscous while the axle is warming up, yet is actually more viscous at 100°C. Ravenol separately specifies a high-pressure-stable lubricating film at high temperatures and loads, excellent EP performance and very good wear protection. It is this combination – exceptional viscosity-temperature behaviour plus a formulation built for severe loading – that puts RHP at the top of our differential-oil range. :contentReference[oaicite:6]{index=6}
ATB, LSD and locking differentials do not all need the same oil
The presence of an upgraded differential does not automatically mean conventional limited-slip oil is required. Plate-type LSDs can depend on specific friction characteristics, while ATB and locking differentials may have different requirements. The actual differential design and its manufacturer's oil specification remain more important than the vehicle model alone.
| Differential use | Oil to look for | Main distinction |
|---|---|---|
| Standard open differential under demanding use | Ravenol RHP 75W-90 | High-performance PAO/USVO differential oil with exceptional viscosity stability and high-load protection |
| ATB or torque-biasing differential | High-quality differential oil matching the manufacturer's requirement | Do not assume an ATB automatically requires conventional LS friction modifiers |
| Plate-type limited-slip differential | Dedicated LS oil or compatible high-performance differential oil | Match viscosity and required limited-slip friction characteristics |
| Selectable or integrated locking differential | Manufacturer-specified differential oil | Check the lubrication requirement for the actual locking differential fitted |
| Hard-used or competition differential | Ravenol RHP 75W-90 where compatible | High load capacity, shear stability, EP performance and wide-temperature viscosity stability |
Dedicated 75W-90 and 80W-90 limited-slip oils
RHP is not intended to make dedicated LS oils redundant. Ravenol LS 75W-90 and LS 80W-90 provide specification-led lubricants for compatible limited-slip differentials requiring those viscosities and friction characteristics. The 75W-90 and 80W-90 split therefore remains mechanically useful rather than simply representing two different thicknesses of the same product.
Standard or upgraded differential
RHP also has a place in standard open differentials where its high-performance characteristics are wanted; it is not restricted to LSD or locking units.
RHP also has a place in standard open differentials where its high-performance characteristics are wanted; it is not restricted to LSD or locking units.
75W-90 or 80W-90
Match the viscosity to the differential requirement rather than assuming every specialist differential uses the same grade.
Match the viscosity to the differential requirement rather than assuming every specialist differential uses the same grade.
Limited-slip characteristics
Plate-type LSDs can require a particular friction behaviour, while ATB and locking differential requirements vary by design.
Plate-type LSDs can require a particular friction behaviour, while ATB and locking differential requirements vary by design.
High-load use
RHP is our top-end differential oil for compatible axles where temperature stability, shear resistance and high-load performance are priorities.
RHP is our top-end differential oil for compatible axles where temperature stability, shear resistance and high-load performance are priorities.
Related differential and gear oil sections
| Section | Use it for |
|---|---|
| Gear Oil | Land Rover gearbox, transfer box and differential oils across the wider drivetrain range |
| 75W-90 GL5 Gear Oil | 75W-90 gearbox and differential oils, including Ravenol RHP and Defender Puma MT82 transmission oil |
| EP80W-90 GL5 Gear Oil | Conventional 80W-90 differential oil for traditional Land Rover axle servicing |
