Product Overview
Transfer Case:
| Year | Model | Generation | Total Capacity | Factory Recommended Lubricants |
| 2001-2006 | Montero | Gen3 | 3.0 qt | Hypoid gear oil API classification GL-4 SAE 75W-85 or 75W-90 |
| 1992-2000 | Montero | Gen2/2.5 | 2.6 qt | Hypoid gear oil API classification GL-4 SAE 75W-85 or 75W-90 |
| 1983-1991 | Montero | Gen1 | 2.3 qt | Hypoid gear oil API classification GL-4 SAE 75W-85 or 80W |
| 1992-2004 | Montero Sport | 2.5 qt | Hypoid gear oil API classification GL-4 SAE 75W-85 or 75W-90 |
Manual Transmission:
| Year | Model | Generation | Total Capacity | Factory Recommended Lubricants |
| 1992-1996 | Montero | Gen2 | 2.6 qt | Hypoid gear oil API classification GL-4 SAE 75W-85 or 75W-90 |
| 1983-1991 | Montero | Gen1 | 2.6 qt | Hypoid gear oil API classification GL-4 SAE 75W-85 or 80W |
| 1992-2004 | Montero Sport | 2.6 qt | Hypoid gear oil API classification GL-4 SAE 75W-85 or 75W-90 |
"Should I get MT-85 or MT-90?"
In the Transfer Case - You can go with either MT-85 or MT-90, they're both in spec (other than Gen1s, technically) and the differences between them are very minor in the transfer case. MT-85 may have a slight edge in MPGs and be a better fit for the daily driver/occasional offroader. Whereas MT-90 may be better for the purpose built offroad rig that spends a lot of time in 4 wheel drive because of the slightly greater protection it offers at higher temps.
In Manual Transmissions - Red Line only recommends MT-85 for Mitsubishi manual transmissions because it results in smoother shifts.
MT-90
- 75W90 GL-4 gear oil (similar to SAE 5W40/10W40 engine oil viscosity)
- Popular in Nissan, Mazda, Mitsubishi, VW/Audi, Lotus Elise/Exige, Toyota, Mendeola transmissions and Atlas transfer cases for Off Road
- Offers quicker shifts, perfect synchronizer coefficient of friction
- Safe for brass synchros, as it lacks the reactive sulfurs found in most GL-5 oils that cause damage
- High performance gear protection and longer synchro life
- Eliminates notchy shifting, even when cold
- Satisfies the gear oil viscosity requirements of 75W90, 80W90, 90 and motor oil viscosities of SAE 40, 10W40 and 15W40
- Recommended for GL-1, GL-3 and GL-4 applications, as well as where most special synchromesh fluids are specified
Since most GL-5 gear oils for differentials are too slippery for manual transmissions, Red Line offers these products that ensure proper shifting while providing ultimate wear protection.
- Appropriate coefficient of friction for most manual transmission synchronizers (other's synthetic gear oils are often too slippery for proper synchro engagement)
- MT-LV, MTL, MT-85 & MT-90 are not for use in differentials with hypoid gears
- Excellent gear and synchro protection, balanced slipperiness for easier shifting in cold climates
- Excellent for high and low mileage transmissions
- Compatible with petroleums and other synthetics
| API Service Class | GL-4 |
| SAE Viscosity Grade (Gear Oil): | 75W90 |
| SAE Viscosity Grade (Motor Oil): | 15W40 |
| Vis @ 100°C, CSt: | 15.5 |
| Vis @ 40°C, CSt: | 82 |
| Viscosity Index: | 200 |
| Pour Point, °C: | -45 |
| Pour Point, °F: | -49 |
| Brookfield Viscosity, Poise: | 320 |
