Red Line full-synthetic D6 ATF is a lower viscosity version of the D4ATF
and is designed for better fuel efficiency in CAFE testing. Dexron VI
requires a different approach to a conventional ATF formulation. Rather
than beginning with a 7.5 cSt fluid and allowing a viscosity loss in use to
drop to 5.5 cSt, the Dexron VI fluid requires a starting viscosity of less
than 6.4 and a final drop to no less than 5.5 cSt. Red Line D6 will drop to
no less than 6.1 cSt. Since the final viscosity after use of these fluids
are similar, Dexron VI fluids can be used where Dexron III fluids were
previously recommended (except for some manual transmission applications,
our customers report).
D6 ATF also provides significantly improved gear protection and will
provide a GL-4 level of gear protection. The balanced frictional
characteristics provide smooth and consistent shifts for extended drain
intervals. The superior stability compared to petroleum ATFs allows
high-temperature operation without varnishing valves and clutches which
leads to transmission failure.
