![]() ![]() Don't wait for the transmission to show signs of wear, internal damage, or fault codes. The automatic transmission filter should be changed during any fluid change. D4 ATF also provides improved shifting in cold weather. The superior stability compared to petroleum ATFs allows high-temperature operation without varnishing valves and clutches which leads to transmission failure. Red line D4 ATF also provides a GL-4 level of gear protection, giving it balanced frictional characteristics that provide smooth and consistent shifts for extended drain intervals. Additional detergents to help ensure a long service life. The oil does a better job of clinging to surfaces, providing not just lubrication but protection as well. These premium base oils are chemically engineered to be more stable under high temps and have superior lubricity than ATF that uses lower-grade Group III oils (most factory oils). Red Line only uses premium Group IV and Group V blended oils to achieve better results than stock OEM fluid. This transmission requires consistent, low-viscosity fluids that are shear-stable, and Redline's D4 ATF easily satisfies those requirements. Red Line D4 ATF is the ideal choice for BMW automatic transmissions. OEM ZF and Red Line Transmissions Filter, Gasket, and Fluid Kit for ZF A5S325Z / 5HP19 5-speed automatic transmission used in E46 323i/325i/328i/330i, E39 525i/528i/530i, E85 Z4. ![]()
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