Red Line D4 ATF Synthetic Transmission Fluid - 1 Quart

Red Line D4 ATF Synthetic Transmission Fluid - 1 Quart

The Ultimate High-Performance Upgrade for Automatic & Manual Transmissions

Upgrade your drivetrain with the precision of Red Line Part #: 30504. D4 ATF is a fully synthetic, ester-based lubricant designed to exceed the requirements of Dexron III, Mercon, and Mercon V specifications. Its unique formulation allows for significantly better high-temperature performance without thinning out, which prevents the "shift flare" and internal wear common in transmissions pushed to their limit. Because it provides the GL-4 level of gear protection, it is also a legendary "secret" for improving the shift feel in many manual transmissions that specify an ATF-grade fluid.

What’s Included in the Box:

- (1) 1 Quart (0.946L) Bottle: Compatible with standard fluid pumps for easy filling.

The Red Line Advantage

- Polyol Ester Base Stocks: Provides unmatched film strength and heat resistance, keeping your transmission cool even under heavy towing or track conditions.

- Superior Shift Quality: Balanced friction modifiers provide the perfect "grab" for clutches and synchronizers, eliminating shudder and providing a buttery-smooth feel.

- Extreme Cold Fluidity: Allows for immediate lubrication and easy shifting in freezing temperatures, protecting your seals and internal valves from the moment you start.

- Extended Drain Intervals: High resistance to oxidation and thermal breakdown means the fluid stays "fresh" longer than conventional petroleum-based ATFs.

- Multi-Purpose Versatility: Safe for use in automatic transmissions, many manual transmissions, and even power steering systems requiring ATF.

Product Specifications

- Viscosity Grade: 75W80 (GL-4)

- Viscosity @ 100°C: 7.5 cSt

- Viscosity Index: 198

- Flash Point: 225°C / 437°F

- Pour Point: -60°C / -76°F

Primary Vehicle Compatibility

- GM: Dexron III, II, and select earlier applications.

- Ford: Mercon, Mercon V, and high-performance power steering.

- Toyota / Lexus: Type T-III, T-IV.

- Honda / Acura: ATF-Z1.

- Nissan / Infiniti: Matic-D, J, & K.

- BMW: Excellent for manual transmissions requiring MTF-LT-1 or LT-2.

Precision Tip: D4 ATF is a "must-have" for owners of BMW, Nissan, and Toyota manual transmissions that specify a thin fluid. If your 1st-to-2nd shift feels "crunchy" or stubborn on cold mornings, swapping to D4 ATF often cures the issue immediately. However, if your modern vehicle requires a "Low Viscosity" fluid (like Dexron VI or Toyota WS), you should look at Red Line D6 ATF instead for the best fuel economy.