Full Product Description
Red Line MT-90 is a high-performance, 75W90 GL-4 gear oil engineered specifically for manual transmissions and transaxles. Unlike many modern gear oils that use reactive sulfur which can damage brass synchronizers, MT-90 is safe for yellow metals, ensuring long-term hardware protection. Its synthetic formula maintains a consistent viscosity, providing a stable film of protection even under extreme heat or heavy loads.
Designed to mimic the friction coefficient of standard synchronizers, MT-90 allows for quicker shifts and smoother engagement across a wide temperature range. It is highly recommended for many Toyota, Mazda, Mitsubishi, and Nissan manual gearboxes, as well as various European models that call for a 75W90 GL-4 fluid.
Key Features & Benefits
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Smooth Shifting: Optimizes synchronizer coefficient of friction to reduce grinding and improve shift quality, especially when cold.
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Yellow Metal Safe: Formulated without the aggressive sulfur additives found in GL-5 oils, making it safe for brass, bronze, and copper components.
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Synthetic Durability: Offers excellent high-temperature stability and longer drain intervals compared to conventional mineral oils.
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Wear Protection: Provides a high film strength to prevent gear tooth wear and pitting under high-performance driving conditions.
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Versatile Compatibility: Meets or exceeds requirements for transmissions calling for 75W90, 80W90, or SAE 90 gear oils with GL-4 specifications.
Technical Specifications
| Feature | Details |
| Brand | Red Line Synthetic Oil |
| Product Number | 50304 |
| Viscosity Grade | 75W90 |
| API Service Class | GL-4 |
| Base Oil | Full Synthetic (Polyol Ester) |
| Volume | 1 Quart (0.94 Liters) |
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