Eliminate Notchy Shifting: Red Line MT-90 75W90 GL-4 Synthetic Gear Oil

Upgrade your manual transmission's performance and longevity with Red Line MT-90 75W90 GL-4 Gear Oil (Part #50304), the industry standard for smooth, reliable shifting in performance vehicles. Available now at Straight Six Imports.

Designed as a full-synthetic, ester-based lubricant, MT-90 provides the perfect balance of gear protection and synchronized coefficient of friction, ensuring precise and quick shifts, even in cold Canadian climates.

Why MT-90 is Essential for Your Transmission:

• Brass Synchro Safe: Unlike many GL-5 gear oils, MT-90 is specifically formulated without the reactive sulfurs that damage sensitive brass synchronizers found in many Nissan (SR20, KA24, RB), Mazda, Mitsubishi, and Toyotamanual transmissions.

• Eliminates Notchy Shifting: Its shear-stable formula provides consistent viscosity across high and low temperatures, drastically reducing or eliminating the frustrating "notchiness" often experienced when shifting cold.

• Optimal Viscosity: Satisfies the requirements for GL-4 applications needing a 75W90 grade (similar to 5W40 / 10W40 engine oil viscosity), ensuring broad compatibility across JDM and European platforms.

• High-Performance Protection: Provides superior gear protection, longer synchronizer life, and ultimate thermal stability for street driving, autocross, and track use.

Give your manual gearbox the fluid it deserves. Switch to Red Line MT-90 and enjoy quicker, smoother gear changes every time.