D4 ATF Red Line's most popular and versatile ATF; D4 is suitable for use where Dexron III, Dexron II, or Mercon fluids are recommended. D4 ATF is a fully-synthetic product designed to satisfy the improved low-temperature requirements which will be in the new Dexron IV specification, and the improved shear-stability requirements which will be part of the new Mercon specifications. Superior stability compared to petroleum ATFs allows high-temperature operation without varnishing valves and clutches which ultimately leads to common transmission failures in high performance applications. Full synthetic formulation flows extremely well and keeps within an ideal viscosity best, providing improved shifting in cold weather.
Many Manual transmissions now call for ATF... Red Line's D4 ATF also provides a GL-4 level of gear protection, making it a superior product for manual transmissions and transaxles like the Corvette's T-56 and several of BMWs manuals as well. The balanced frictional characteristics provide smooth and consistent shifts even for extended drain intervals.
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