Synthetic D4 ATF (Quart)

REDLINE OIL Synthetic D4 ATF is a premium synthetic transmission fluid formulated to meet or exceed Dexron III, Dexron II, Mercon, and Mercon V specifications. This quart bottle delivers full synthetic performance in a convenient single-unit size, making it ideal for routine transmission maintenance, fluid top-offs, or small-batch restoration work on vehicles that demand precise fluid compatibility.

The synthetic formulation provides superior thermal stability compared to conventional mineral-based ATF, maintaining viscosity consistency across a wider temperature range and reducing sludge accumulation over extended service intervals. Multi-spec approval means this fluid can be safely used in older transmissions calling for Dexron II, modern Dexron III systems, and Ford Mercon applications without compatibility issues. The 1-quart container (1.91 lbs) stores conveniently in any garage or vehicle emergency kit for field-level top-ups or between-service maintenance.

Owners maintaining classic muscle cars, vintage trucks, and older imports appreciate REDLINE's synthetic ATF for its ability to restore smooth shift feel and reduce transmission heat in vehicles where original fluid specifications may no longer be in production. The synthetic base stock resists oxidation better than conventional mineral oils, extending the useful life of seals and internal components even in high-heat driving conditions. This product is essential for serious enthusiasts who want verified, specification-compliant transmission maintenance without guesswork.

Always verify your vehicle's transmission fluid requirement before use and consult your owner's manual or service documentation to confirm compatibility with your specific transmission type.