The Most Versatile Fluid: Red Line D4 ATF Full Synthetic

Discover the superior protection and consistent performance of Red Line D4 ATF Full Synthetic Fluid (Part #30504), the industry’s most versatile transmission lubricant, available now at Straight Six Imports. Engineered with ester base stocks, D4 ATF provides a massive upgrade for a wide range of both automatic and manual transmissions/transaxles.

D4 ATF is designed to meet numerous OEM specifications (Dexron III/H, Mercon V, Honda Z1, Toyota T-IV, Nissan Matic-J/K) but delivers far superior thermal stability and shear protection than petroleum-based fluids. This high stability prevents varnishing of valves in automatics and ensures consistent performance under high-heat track conditions.

Key Performance & Versatility Features:

• Proven Manual Transmission Upgrade: Uniquely provides a GL-4 level of gear protection, making it an essential upgrade for many Honda, Acura, and late-model BMW manual gearboxes and transaxles where shifting is notchy or slow, especially when cold.

• Superior Cold Weather Operation: Designed with excellent low-temperature properties, eliminating the "morning stiffness" or notchiness often felt in manual gearboxes before they warm up.

• High-Temperature Stability: Allows for high-temperature operation without varnishing valves and clutches, drastically extending the lifespan of automatic transmission components.

• Shear Stable: The full-synthetic formula maintains its viscosity integrity under high stress, ensuring the fluid performs consistently throughout extended drain intervals.

• Ideal for Multiple Systems: Excellent for use in automatic transmissions, manual transmissions requiring a lightweight GL-4 fluid, and many high-performance power steering systems.

For maximum versatility, superior protection, and smoother operation across your vehicle's drivetrain, choose Red Line D4 ATF (30504).