Ravenol RHP 75W-90 USVO Racing Differential Oil – 1L
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Description
Ravenol RHP Racing High Performance Gear SAE 75W-90 sits at the top of our differential-oil range for traditional Land Rover axles. Developed as a PAO-based fully synthetic racing gear oil with Ravenol USVO technology, RHP combines exceptional viscosity stability with high load-carrying capacity, excellent EP wear protection, outstanding shear stability and low foaming. Ravenol specifically formulates RHP with limited-slip properties and recommends it for highly loaded rear axles with integrated locking differentials; Twinwoods stocks it as a premium differential oil for Defender, Discovery 1 and Discovery 2 axles, including standard open differentials and compatible locking or limited-slip units.
Why RHP Works So Well in a Land Rover Differential
75W-90 can sound like a thinner modern oil compared with the traditional 80W-90 normally associated with Land Rover axles, but the actual viscosity data tells a very different story. RHP measures 92.6 mm²/s at 40°C and 16.1 mm²/s at 100°C, with a viscosity index of 188. Ravenol EPX mineral 80W-90 measures 130.3 mm²/s at 40°C but 14.3 mm²/s at 100°C, with a viscosity index of 108.
RHP is considerably less viscous while the axle is warming up, yet is actually more viscous at 100°C. That is probably the clearest demonstration of what its PAO and USVO formulation achieves. The oil does not need to be extremely heavy at lower temperatures simply to retain substantial SAE 90 viscosity once the differential becomes hot.
A viscosity index of 188 is exceptionally high for a gear oil and explains how RHP can combine much better cold flow with substantial SAE 90 viscosity when hot. RHP remains more viscous than EPX at 100°C, while Ravenol separately specifies high load-carrying capacity and a high-pressure-stable lubricating film under high oil temperatures and loads. Those are related advantages, but they are not the same claim: viscosity-temperature stability comes from the measurable viscosity data, while load and film performance are part of Ravenol’s stated formulation characteristics.
| Property | Ravenol RHP 75W-90 | Ravenol EPX 80W-90 GL-5 |
|---|---|---|
| Oil type | PAO-based fully 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 |
| Brookfield viscosity | 33,800 mPa·s at -40°C | 60,100 mPa·s at -26°C |
| Pour point | -57°C | -33°C |
The Brookfield figures are measured at different temperatures, so they are not a direct numerical comparison. What they do show is the exceptional low-temperature behaviour of RHP: it remains highly fluid even at a test temperature 14°C lower than that used for the conventional mineral 80W-90.
High-Load Protection Without Sacrificing Cold Flow
A Land Rover differential needs far more than the correct nominal viscosity. The hypoid gears operate under high sliding loads, while the crownwheel constantly churns the oil and the complete axle can become very hot during prolonged hard use. Ravenol specifies RHP for a high-pressure-stable lubricating film at high oil temperatures and loads, together with outstanding shear stability, excellent thermal stability, excellent EP properties, high load-carrying capacity and very good wear protection.
That combination is what makes RHP particularly interesting for a Land Rover. It flows far more readily at low temperatures than a conventional mineral 80W-90, maintains exceptional viscosity stability as temperature rises, and is separately formulated to cope with the pressure, shear and heat generated inside highly loaded differentials.
The foam-control data is equally strong. ASTM D892 results are 0/0, 10/0 and 0/0 through the three test sequences, with no foam remaining after settling. That matters in a differential where the rotating crownwheel is continuously agitating the lubricant and the oil needs to remain consistent rather than becoming heavily aerated.
RHP also records a 1b copper-strip corrosion result at 121°C. Ravenol states good compatibility with non-ferrous metals and sealing materials, alongside strong ageing and oxidation resistance. The result is a racing-derived oil whose advantages for a Land Rover differential can be seen in the published engineering data rather than relying on motorsport branding alone.
Land Rover Differential Use
- Defender front and rear differentials
- Discovery 1 front and rear differentials
- Discovery 2 front and rear differentials
- Other traditional Land Rover hypoid axles requiring this viscosity and type of differential lubricant
- Standard open differentials
- Compatible locking and limited-slip differentials
- Hard-used vehicles including towing, higher engine output, sustained motorway use, expedition and off-road work
- Competition and other high-load axle use
Conventional mineral EP gear oil remains entirely suitable for routine Land Rover differential servicing. RHP goes considerably further: a PAO full-synthetic oil with markedly better viscosity-temperature stability, exceptional cold-flow behaviour and a formulation developed specifically around high loads, shear stability, EP protection and temperature control.
Product Specification
| Specification | Details |
|---|---|
| Product | Ravenol RHP Racing High Performance Gear SAE 75W-90 |
| Viscosity | SAE 75W-90 |
| Oil type | PAO-based fully synthetic |
| Technology | Ravenol USVO |
| Differential characteristics | Limited-slip properties, high load-carrying capacity, EP wear protection and low foaming |
| Pack size | 1L |
| Container | Easy-pour spout |
| Manufacturer article number | 1145100-001 |
Technical Product Data
| Property | Unit | Data | Audit |
|---|---|---|---|
| Colour | Gold | VISUELL | |
| Foaming tendency | . | DIN 51757 | |
| Seq. I at 24 °C | ml/ml | 0/0 | ASTM D892 |
| Seq. II at 93,5 °C | ml/ml | 10/0 | ASTM D892 |
| Seq. III at 24 °C after 93,5 °C | ml/ml | 0/0 | ASTM D892 |
| Viscosity at 100 °C | mm²/s | 16,1 | DIN 51659-2 |
| Viscosity at 40 °C | mm²/s | 92,6 | DIN 51659-2 |
| Viscosity Index VI | 188 | DIN ISO 2909 | |
| Brookfield Viscosity at -40 °C | mPa*s | 33.800 | ASTM D2983 |
| Copper Strip Test at 121 °C | 1b | ASTM D130 | |
| Density at 20 °C | kg/m³ | 868,0 | EN ISO 12185 |
| Flashpoint | °C | 200 | DIN EN ISO 2592 |
| Pourpoint | °C | -57 | DIN ISO 3016 |
Related Gear Oils
See our wider Land Rover gear oil section for differential, gearbox and transfer box lubricants. Oils for compatible locking and limited-slip differentials are grouped in our ATB & Limited Slip Differential Oil section.
Additional information
| Weight | 1 kg |
|---|---|
| Dimensions | 25 × 10 × 10 cm |
Brand
Brand
Ravenol
Ravenol is our main lubricant brand for Land Rover servicing, covering engine oils, manual and automatic gearboxes, transfer boxes, differentials, ACE and power steering, brake fluid, coolant, grease and specialist workshop fluids.
We use Ravenol because the range lets us select the lubricant around the actual engine, gearbox, axle or hydraulic system rather than relying on viscosity alone. The result is a deliberately selected Land Rover range in which every product has a defined job, from TD5 engine oil and R380 MTF-94 to specialist ZF ATF, LT230 oil, limited-slip differential oil and later transfer-box fluids.
Why Twinwoods partners with Ravenol
Ravenol is a genuine German lubricant manufacturer, developing and producing its oils, fluids and greases in Germany. The range is backed by unusually detailed technical data, which matters to us because lubricant choice should be based on much more than the viscosity printed on the bottle. We use Ravenol in our service kits, recommend it for the Land Rovers we specialise in and use it in vehicles we work on ourselves. More importantly, the range gives us properly specialised products for different engines, gearboxes, transfer boxes, axles and hydraulic systems rather than trying to make one generic lubricant cover everything.Ravenol oils and fluids for Land Rover
| System | Ravenol products | What matters |
|---|---|---|
| Engine oil | VMO, RUP, Turbo-C HDC, TSi, FO, FLJ, VMP, SFE and Formel Extra | Engine, viscosity, specification, emissions equipment and how the vehicle is used |
| Manual gearboxes | MTF-2 / MTF-94 for the R380 and VSG 75W-90 for the Defender Puma MT82 | Gearbox type and complete lubricant specification rather than viscosity alone |
| Automatic gearboxes | ATF 5/4 HP and ATF Dexron III H | ATF 5/4 HP is our specialist choice for the Discovery 2 ZF 4HP gearbox, while Dexron III H covers compatible general ATF duties |
| Transfer boxes | MZG 80W-90 and VSG 75W-90 for the LT230, plus DTF-1 for compatible later active transfer boxes | Transfer box design and the fluid specification required by that particular unit |
| Axles and differentials | EPX 80W-90, VSG 75W-90, RHP 75W-90, LS 75W-90 and LS 80W-90 | Standard, ATB or limited-slip differential design together with the required viscosity and friction characteristics |
| ACE and power steering | SSF and ATF Dexron III H | Hydraulic system and the correct fluid specification |
| Brakes and clutch | DOT 4 LV and DOT 4 | DOT 4 LV is our main brake and clutch fluid, with conventional DOT 4 retained where appropriate |
| Cooling systems | C12+ OAT and C12evo Si-OAT coolant concentrates | Coolant technology, engine and the fluid already in the cooling system |
| Grease | MoS2 Multi-Purpose Grease, LI-86 Bearing & Propshaft Grease and HRG 2 Hot Red Grease | MoS2 for broad workshop and driveline use, LI-86 for bearings and universal joints, and HRG 2 for high-temperature grease duties |
| Workshop fluids | Professional Engine Cleaner and Winter Screenwash Concentrate | Purpose-specific maintenance products alongside the main lubricant range |
More than the correct number on the bottle
Two oils carrying the same viscosity grade can be very different products. Base oil, additive chemistry, volatility, viscosity stability, friction characteristics and manufacturer specifications all affect how a lubricant behaves once it is hot and working inside the component. That is particularly important with Land Rovers. An R380 gearbox, LT230 transfer box, Rover differential, ZF automatic gearbox and electronically controlled later transfer box all place different demands on their lubricant. We select the Ravenol product around the component itself rather than simply finding the nearest familiar viscosity.Identify the component
Start with the engine, gearbox, transfer box, differential or hydraulic system being serviced.
Match the specification
Check the complete ACEA, API, GL, manufacturer or transmission-fluid requirement rather than viscosity alone.
Consider vehicle use
Standard servicing, towing, off-road use and highly tuned engines can place very different demands on the lubricant.
Check existing fluid
Coolant, hydraulic fluids and specialist transmission oils should not be mixed simply because their colour or general description appears similar.
Ravenol engine oil
Our Ravenol engine-oil range runs from traditional oils for 200TDI, 300TDI and classic petrol engines through to specialist oils for TD5, Defender Puma TDCI and later Land Rover engines. Ravenol VMO 5W-40 remains our main TD5 recommendation, RUP 5W-40 covers very highly tuned TD5 engines, Turbo-C HDC 15W-40 is our preferred oil for standard 200TDI and 300TDI engines, while FO, FLJ, VMP and SFE cover the relevant later engine and emissions-system requirements.Related Ravenol and oil sections
| Section | Use it for |
|---|---|
| Oils, Grease & Fluids | The complete Twinwoods lubricant, coolant and service-fluid range |
| Engine Oil | Engine oils selected around Land Rover engines, viscosity and specification |
| Gear Oil | R380, MT82, LT230, differential and specialist transfer-box oils |
| ATF & Steering Fluid | Automatic transmission and power-steering fluids |
| ACE Fluid | Discovery 2 Active Cornering Enhancement hydraulic fluid |
| Antifreeze & Coolant | OAT and Si-OAT coolant for different generations of Land Rover |
| Brake Fluid | DOT 4 and DOT 4 LV brake and clutch fluids |
| Land Rover Grease | Grease for propshafts, universal joints, bearings, high-temperature use and general workshop lubrication |
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Delivery
Twinwoods 4x4 ships Land Rover parts across the UK and around the world. We regularly send parts overseas and use trusted tracked courier services so UK and international customers can order with confidence.
Standard UK shipments are normally sent with DPD. UK orders containing oils or fluids are normally sent with DHL where required, because some carriers restrict liquid shipments.
Worldwide delivery is available through DPD and DHL Express, depending on the destination, parcel size, weight and available courier services. Add the parts you need to your basket, enter your delivery address, and the checkout will show the available delivery options and prices before payment.
Free mainland UK postage and packaging is available on eligible orders over £99, subject to our delivery terms and conditions.
Returns
Up to 60-day returns
Change-of-mind return carriage at your cost
Check fitment before ordering
Extended 60-day returns.
In addition to your statutory rights, eligible products can be returned for up to 60 days from delivery. Our extended returns policy automatically applies to individual products purchased for less than £250 including VAT. Products costing £250 or more may still be accepted for return at our discretion.
Please choose carefully before ordering.
Check part numbers, fitment and suitability before purchase. Please do not order parts simply to try them or on the assumption that they can be fitted and then returned if unsuitable.
- Changed your mind within 14 days? UK and EEA consumers have statutory cancellation rights. Tell us within 14 days of receiving your order, then return the goods within the following 14 days.
- Need longer? Eligible products can be returned under our voluntary extended returns policy. Contact us within 60 days of delivery and, once the return has been agreed, send the goods back within 14 days.
- Extended returns must be unused, unfitted, complete and suitable for resale as new. Goods must be undamaged, unmarked and uncontaminated, with all components and accessories supplied and their original product packaging where this formed part of the supplied product.
- A £10 handling charge applies to extended returns. This is charged once per return consignment, regardless of how many eligible products are returned together. It does not apply where your statutory cancellation rights apply.
- Return carriage and safe packing are your responsibility for change-of-mind returns.
- Managed UK returns: where suitable, we can provide a convenient prepaid tracked return service with straightforward drop-off, proof of handover and tracking linked to your return. The cost will be advised before it is arranged and may be deducted from your refund.
- Please do not fit or attempt to fit a part unless you intend to keep it. Fitting, attempted fitting, contamination, damage or excessive handling can substantially reduce the value of the goods. A product which has been fitted or used will not normally qualify for our voluntary extended returns policy.
- Faulty, damaged or incorrectly described? Contact us first. We will advise the appropriate return method and will normally provide a prepaid return service or cover reasonable agreed return costs.
Returning it yourself?
Please use a tracked, insured return service appropriate to the value and nature of the goods, pack and address the parcel correctly, and retain sufficient evidence to identify and trace the return. You remain responsible for the goods until they reach us.
Returns – quick FAQs
How long do I have to return an item?
Eligible products can be returned for up to 60 days from delivery under our voluntary extended returns policy.
For UK and EEA consumers, statutory change-of-mind cancellation rights also apply: tell us within 14 days of receiving your order, then return the goods within the following 14 days.
For UK and EEA consumers, statutory change-of-mind cancellation rights also apply: tell us within 14 days of receiving your order, then return the goods within the following 14 days.
Which products qualify for 60-day returns?
Our extended returns policy automatically applies to individual products purchased for less than £250 including VAT.
Products purchased for £250 or more are not automatically covered, although we may agree to accept them for return at our discretion. Eligibility is based on the price of each individual product rather than the total order value.
Products purchased for £250 or more are not automatically covered, although we may agree to accept them for return at our discretion. Eligibility is based on the price of each individual product rather than the total order value.
Is there a charge for an extended return?
Returns made under our voluntary extended returns policy are subject to a £10 handling charge per return consignment, regardless of the number of eligible products returned together.
This charge does not apply where the return is being made under your statutory cancellation rights.
This charge does not apply where the return is being made under your statutory cancellation rights.
Who pays return carriage?
For change-of-mind returns, return carriage and safe packing are your responsibility.
Where suitable, we can provide a prepaid tracked return service and advise the cost before it is arranged.
If an item is faulty, damaged or incorrectly described, contact us first. Where return is reasonably required, we will normally provide a prepaid return service or cover reasonable return costs agreed with us.
If an item is faulty, damaged or incorrectly described, contact us first. Where return is reasonably required, we will normally provide a prepaid return service or cover reasonable return costs agreed with us.
What condition must an extended return be in?
Goods returned under our extended returns policy must be unused, unfitted, complete and suitable for resale as new.
They must be undamaged, unmarked and uncontaminated, with all components and accessories supplied and their original product packaging where this formed part of the supplied product.
Can I fit a part and then return it?
Please check fitment and suitability before installation.
Please do not fit or attempt to fit a part unless you intend to keep it.
Once a part has been fitted or an attempt has been made to fit it, it may be marked, contaminated, damaged or otherwise unsuitable for resale as a new part. Fitted or used goods will not normally qualify for our voluntary extended returns policy.
Where statutory cancellation rights apply, handling beyond what is reasonably necessary to inspect the goods may result in a reduction to your refund if it has reduced their value.
Once a part has been fitted or an attempt has been made to fit it, it may be marked, contaminated, damaged or otherwise unsuitable for resale as a new part. Fitted or used goods will not normally qualify for our voluntary extended returns policy.
Where statutory cancellation rights apply, handling beyond what is reasonably necessary to inspect the goods may result in a reduction to your refund if it has reduced their value.
What if the item is faulty?
Contact us before returning it. Where a return is reasonably required for a faulty, damaged or incorrectly described item, we will normally provide a prepaid return service or cover reasonable return costs agreed with us.
Are any items excluded from 60-day returns?
Products purchased for £250 or more including VAT are not automatically covered by our extended returns policy, although we may agree a return at our discretion.
Extended returns must also meet the condition requirements above. Statutory exclusions and any separate statutory rights continue to apply as set out in our full Terms & Conditions.
Extended returns must also meet the condition requirements above. Statutory exclusions and any separate statutory rights continue to apply as set out in our full Terms & Conditions.
How do I start a return?
Contact us
Please include your order number and a brief reason for the return. Do not send anything back until you have received the appropriate return instructions.
Warranty
Buy with confidence: all new parts sold by Twinwoods 4x4 include at least 12 months manufacturer warranty against defects in materials and workmanship under normal use.
Some products and brands may include a longer warranty period where this is provided by the manufacturer. Where applicable, this will normally be stated on the individual product page or covered by the manufacturer’s own warranty terms.
Warranty cover applies to manufacturing defects. It does not cover misuse, incorrect fitting, competition use unless stated, contamination, modification, damage during installation, normal wear and tear, or failure caused by an unrelated vehicle fault. For certain components, proof of professional fitment may be required.
Warranty claims may require the part to be returned for inspection and/or supplier testing before the claim is accepted. Any advance replacement is discretionary.
Warranty remedies relate to the part itself, meaning repair or replacement, or refund if those are not possible. Warranty does not cover labour, removal or refitting, diagnostics, consumables, travel or other incidental costs.
This warranty is in addition to your legal rights and does not reduce those rights.
For full details, please see our Terms and Conditions.
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