Red Line 50505 MT-85 75W85 GL-4 Manual Transmission Gear Oil - 3.78L
Full-synthetic Red Line manual transmission lubricant for manual gearboxes and transaxles requiring SAE 75W85 and API GL-4 or a specifically supported equivalent specification as listed in the compatibility table.
MT-85 is an ester-based high-performance manual transmission lubricant designed to provide strong gear and synchroniser protection while maintaining the friction characteristics required for clean synchroniser engagement and positive shifting.
Its 75W85 viscosity positions MT-85 between Red Line MTL 75W80 and MT-90 75W90. The shear-stable formulation is designed to maintain consistent viscosity in hot and cold operating conditions, helping reduce gear noise and improve shift quality.
Red Line recommends MT-85 for a range of manual transmissions including supported Nissan, Mitsubishi, Hyundai, Kia, Chrysler/Dodge, GM, Mercedes-Benz, Volkswagen/Audi and other applications. It is also suitable where supported GL-1, GL-3 or GL-4 manual-transmission lubricants are specified.
- Product type: Full-synthetic manual transmission gear oil
- Product range: MT-85
- Primary use: Synchronised manual transmissions and transaxles
- Location / system: Manual gearbox / transaxle
- Brand: Red Line Synthetic Oil
- Product reference / SKU: 50505
- Viscosity / grade: SAE 75W85
- API service class: GL-4
- Additional recommended API applications: GL-3 / GL-1
- Container size: 1 US gallon / approximately 3.78L
- Viscosity at 100°C: approximately 12 cSt
- Viscosity at 40°C: approximately 62 cSt
- Viscosity index: approximately 198
- Pour point: approximately -48°C
- Application note: Designed around manual-transmission synchroniser friction requirements
- Restriction: Not intended for differentials with hypoid gears
Fitment advice: Use MT-85 where SAE 75W85 API GL-4 manual transmission oil or one of Red Line's specifically listed equivalent specifications is required. This product is intended for manual transmissions and transaxles and should not be selected simply because a differential also calls for a similarly numbered gear-oil viscosity.
Other items to consider: When changing manual transmission oil, you may also want to consider purchasing replacement drain and fill plug washers, gearbox seals or related drivetrain service components where required.
Useful tools / consumables: Fluid transfer pump, drain pan, suitable sockets or spanners, torque wrench, gloves, workshop towels and brake cleaner for external clean-up.
Difficulty guide: DIY Difficulty: Moderate. Gearbox oil replacement is generally straightforward, but the correct lubricant specification, fill level and drain/fill procedure must be observed.
Why Red Line? Red Line Synthetic Oil is known for high-performance lubricants, fluids and additives developed for demanding road, track and motorsport use. Red Line products are chosen by enthusiasts and workshops for their focus on protection, thermal stability, shift quality, friction control and application-specific performance.
What’s in the bottle: One 1 US gallon / approximately 3.78L container of Red Line MT-85 75W85 GL-4 Manual Transmission Gear Oil.
Service notes: Drain the existing transmission lubricant and refill to the vehicle or gearbox manufacturer's specified level. MT-85 is intended for suitable manual transmissions and transaxles; it is not intended for hypoid differentials.
| Make | Model | Sub Variant | Chassis / Code | Years | Power (PS) | Engine Codes | Fuel | Transmission | Notes |
|---|---|---|---|---|---|---|---|---|---|
| Various | Various | Supported manual transmission / transaxle applications | — | — | — | — | — | Manual | For applications requiring SAE 75W85 API GL-4/GL-3/GL-1 or another Red Line-listed equivalent. Not for hypoid differentials. |
| Nissan | 350Z / 370Z and other supported applications | Manual transmission | — | — | — | — | Petrol | Manual | Red Line recommends MT-85 for supported Nissan manual transmissions, including listed Nissan MTF specifications. |
| Mitsubishi | Various supported models | Including Evolution applications | — | — | — | — | Petrol | Manual | Supports specified Mitsubishi DiaQueen manual transmission oil applications and MZ313376. |
| Hyundai / Kia | Various supported models | 75W85 GL-4 applications | — | — | — | — | Petrol / Diesel | Manual | Supported for listed Hyundai/Kia manual transmission specifications including API GL-4 SAE 75W85 applications. |
| Vehicle Manufacturer | OEM Reference / Specification |
|---|---|
| Red Line | 50505 — MT-85 75W85 GL-4 Manual Transmission Gear Oil, 1 US gallon / approximately 3.78L |
| Red Line | API GL-4; recommended for supported API GL-3 and GL-1 manual transmission applications |
| Red Line | SAE 75W85 / 85; typical viscosity 12 cSt at 100°C and 62 cSt at 40°C |
| Castrol | BOT 0063; BOT 402; Syntorq LT |
| Chrysler / Dodge | 04637579; 04874459; 04874464; 9.5550-MZ1; MS-9070; NV4500 |
| Fiat / Alfa Romeo | 9.5550-MZ1 |
| General Motors | 1940182; 10953477; 12346190; 88862472; 88862473; 93165290; 93740319 |
| Hyundai / Kia | 04300-00110; 04300-00140; 08950-00020-A; 08950-00020-B; API GL-4 SAE 75W85 fill-for-life applications |
| Mercedes-Benz | MB 235.16; MB 235.31; MB 235.4; MB 235.5; MB 001 989 14 03; MAN 341 Typ Z4 |
| Mitsubishi | 3717610; MZ313376; DiaQueen Transmission Oil; DiaQueen Super Multi Gear Oil |
| Nissan | MTF HQ Multi 999MP-MTF00P; KE916-99931; KE916-99932R; KE916-99942R; KE916-99962; KLD26-75802; MT-XZ |
| Opel | B 040 2071 |
| Tremec | HP-MTF™ Manual Transmission Fluid |
| Volkswagen / Audi | G 052 190; G 055 190 |
| Application restriction | Manual transmission / transaxle lubricant; MT-85 is not intended for hypoid differentials |