Motul 1L Transmision MOTYLGEAR 75W90 - Technosynthese - API GL-5 / MIL-L-2105D

Technosynthese Gear Oil That Stays in Grade Under Shear and Keeps Shifts Smooth in Cold and Hot Conditions

Motul MOTYLGEAR 75W90 (MOT109055) is a Technosynthese extreme pressure gear oil formulated for manual transmissions, transfer cases, and hypoid differentials that do not use limited slip friction modifiers. Combining mineral and synthetic base stocks, MOTYLGEAR 75W90 maintains its SAE 75W-90 viscosity grade after the KRL 20-hour shear test per SAE J306, ensuring consistent film protection even under sustained heavy loads. The formula meets API GL-4 and API GL-5 standards as well as MIL-L-2105D, covering a wide range of OEM transmission specifications across cars and commercial vehicles.

Key Features

• Technosynthese formulation combining synthetic and mineral base stocks for superior thermal stability and shear resistance
• Maintains viscosity grade 90 after KRL 20-hour shear test per SAE J306
• Extreme pressure additive package provides anti-wear protection for gears operating under shock loads and high contact pressures
• High viscosity index (175) reduces viscosity change across temperature extremes
• Pour point of -50°C / -58°F allows fluid gear shifting in cold ambient conditions
• Flash point of 198°C / 388°F provides a wide operating safety margin at elevated temperatures
• Compatible with all seal and yellow metal materials used in gearbox design
• Anti-corrosion and anti-foam properties protect internal transmission components
• Meets API GL-4, API GL-5, and MIL-L-2105D specifications
• Suitable for synchronized and non-synchronized gearboxes, transfer cases, and hypoid differentials without limited slip

Specifications

What's Included

• 1 x 1-Liter Can of Motul MOTYLGEAR 75W-90 Technosynthese Gear Oil

Frequently Asked Questions

MOTYLGEAR 75W90 is recommended for all manual transmissions, synchronized and non-synchronized gearboxes, transfer cases, and hypoid differentials without a limited slip system. It is especially recommended for gearboxes that are hard to shift or noisy, where the extreme pressure formulation and low pour point help restore smoother operation.

No. MOTYLGEAR 75W90 does not contain friction modifiers and is not suitable for limited slip differentials (LSD), posi-traction units, or torque-sensing differentials that require an LSD-compatible fluid. Using it in an LSD application may cause chatter, shudder, or accelerated clutch pack wear. Use a fluid specifically rated for limited slip applications in those cases.

Yes. MOTYLGEAR 75W90 meets both API GL-4 and API GL-5 standards, as well as MIL-L-2105D. This dual rating makes it suitable for a wide range of manual gearboxes that specify either GL-4 or GL-5, but always verify your vehicle manufacturer's specific recommendation before filling.

MOTYLGEAR 75W90 uses Motul's Technosynthese technology, which blends high-quality mineral and synthetic base stocks. A fully synthetic gear oil uses 100% synthetic base stocks. MOTYLGEAR 75W90 delivers excellent thermal stability, shear resistance, and cold-weather performance at a more accessible price point than a full synthetic, while still meeting GL-4 / GL-5 specifications.

A viscosity index of 175 means the fluid's viscosity changes relatively little across a wide temperature range. At cold temperatures, MOTYLGEAR 75W90 remains fluid enough for easy gear engagement (pour point -50°C / -58°F). At high operating temperatures, it retains a sufficient oil film for gear protection. This wide VI reduces wear during cold starts and prevents thermal breakdown at sustained high loads.

Change intervals should follow the vehicle manufacturer's specifications and be adjusted based on severity of use. Off-road, track, or towing applications subject the fluid to more stress and may require more frequent changes than highway driving. Inspect the fluid condition during oil change intervals and replace if it appears contaminated, discolored, or if the transmission develops noise.

Yes. Motul formulates MOTYLGEAR 75W90 to be compatible with all seal types and yellow metal materials (brass, bronze, copper alloys) commonly used in gearbox construction. It will not swell, shrink, or degrade standard gearbox seals under normal operating conditions.

One liter (MOT109055) is sufficient for top-off service on many manual gearboxes or as part of a partial fill. Most manual transmissions hold between 1.5 and 3 liters total. Check your service manual for the exact fluid capacity of your specific transmission to determine how many liters are needed for a full drain and fill service.

Installation Instructions

1. Warm up the vehicle by driving for 5 to 10 minutes to allow the existing fluid to drain more completely.
2. Place a drain pan of adequate size under the transmission drain plug.
3. Remove the fill plug first before removing the drain plug to ensure the fill port is accessible.
4. Remove the drain plug and allow old fluid to drain completely.
5. Reinstall and torque the drain plug to the manufacturer's specification.
6. Fill the transmission with Motul MOTYLGEAR 75W90 through the fill port until fluid begins to seep out or until the correct measured volume has been added per the service manual specification.
7. Reinstall the fill plug and torque to specification.
8. Wipe down any spilled fluid and check for leaks with the vehicle at operating temperature.

WARNING: This product can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and reproductive harm. For more information go to www.P65Warnings.ca.gov.