Redline D4 ATF is a synthetic automatic transmission fluid built to cover a wide spread of older and import specs: Dexron II/III, Mercon and Mercon V, plus Toyota T-III/T-IV, Honda ATF-Z1, Nissan Matic D/J/K, Diamond SP-II/SP-III and Mazda ATF M-V. It also works in manual gearboxes and transaxles such as the T-5, T-45 and T-56, where Redline claims GL-4-level gear protection. Its selling point against ordinary Dexron/Mercon fluids is one bottle that covers many vehicles, including most BMW and Audi/VW automatics, with strong cold-weather flow. It suits owners of older or mixed-fleet vehicles who want a single fluid and are willing to pay more than basic mineral ATF.
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Owners of older automatics and manual gearboxes report smoother, more consistent shifts, especially in cold weather, and like having one fluid for several vehicles. Criticism centers on the lack of formal OEM approvals and the higher cost than basic ATF.
Redline D4 ATF is an automatic transmission fluid. It can be used where Dexron III, Dexron II, Mercon and Mercon V fluids are recommended. It is suitable for automatic transmissions, manual transmissions and power steering.
It is also used in manual transmissions and transaxles such as the T-5, T-45, T-56 and late-model BMW. In these, it provides a GL-4 level of gear protection. It is designed for excellent cold weather operation.
