80W-90 GL-4 Gear Oil
80W-90 GL-4 gear oil for Land Rover drivetrain servicing, including Ravenol MZG mineral EP oil – our traditional mineral oil for the LT230 transfer box.
LT230 suitability is determined by the complete lubricant formulation, not simply whether GL-4 or GL-5 appears on the bottle. MZG combines the traditional 80W-90 mineral formulation with strong load-carrying performance, corrosion protection and good compatibility with metals and sealants.
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80W-90 GL-4 oil for the LT230
Ravenol MZG is our traditional mineral choice for Land Rover LT230 transfer boxes. Its SAE 80W-90 mineral EP formulation provides a durable lubricating film under load, good cold-flow behaviour, oxidation stability, corrosion protection and neutral behaviour towards metals and sealing materials.
| Job | Best place to start | Why |
|---|---|---|
| Traditional LT230 oil change | Ravenol MZG 80W-90 | Mineral 80W-90 EP gear oil selected by Twinwoods as our conventional LT230 lubricant. |
| Premium fully synthetic LT230 oil | Ravenol VSG 75W-90 | Fully synthetic alternative with excellent low-temperature behaviour, very high shear stability and excellent non-ferrous-metal compatibility. |
| Conventional Rover / Land Rover differential | 80W-90 GL-5 Gear Oil | Our traditional mineral differential oils are grouped separately around their primary hypoid final-drive use. |
GL-4, GL-5 and the LT230
API GL classification describes gear-oil performance, but it does not by itself determine whether an oil is suitable for an LT230 or compatible with yellow-metal components. The additive chemistry and complete formulation of the individual lubricant matter.
MZG carries API GL-4 and achieves an ASTM D130 copper strip result of 1b. We stock it for the LT230 because the complete 80W-90 mineral formulation suits the transfer box, not simply because GL-4 appears on the specification sheet. Ravenol VSG demonstrates the same point from the other direction: it carries both API GL-4 and GL-5 while remaining an excellent premium fully synthetic LT230 oil.
MZG for traditional LT230 service
Mineral SAE 80W-90 with a durable EP oil film, high load-carrying capacity and good corrosion and oxidation protection.
Mineral SAE 80W-90 with a durable EP oil film, high load-carrying capacity and good corrosion and oxidation protection.
VSG for premium LT230 service
Fully synthetic SAE 75W-90 with excellent cold flow, very high shear stability and excellent compatibility with non-ferrous metals.
Fully synthetic SAE 75W-90 with excellent cold flow, very high shear stability and excellent compatibility with non-ferrous metals.
GL rating is not a yellow-metal test
Do not treat GL-4 as automatically safe or GL-5 as automatically unsuitable. Compatibility depends on the individual oil formulation.
Do not treat GL-4 as automatically safe or GL-5 as automatically unsuitable. Compatibility depends on the individual oil formulation.
Component use still matters
Gearbox, transfer-box and differential oils should be selected around the actual component and lubricant formulation rather than viscosity or GL classification alone.
Gearbox, transfer-box and differential oils should be selected around the actual component and lubricant formulation rather than viscosity or GL classification alone.
Related gear oil sections
| Section | Use it for |
|---|---|
| Gear Oil | Manual gearbox, transfer-box and differential oils organised by component, viscosity and specification. |
| 75W-90 GL-4 Gear Oil | Ravenol VSG for Defender Puma MT82 gearboxes and premium fully synthetic LT230 servicing. |
| 80W-90 GL-5 Gear Oil | Traditional mineral oil for conventional Rover / Land Rover open hypoid differentials. |
| Special Transfer Box Oil | Dedicated fluids for transfer cases requiring a specialist transfer-box fluid rather than conventional gear oil. |
| MTF-94 Gearbox Oil | Manual gearboxes requiring the MTF-94 fluid specification. |
