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There is no such oil as Dexron 4, there is Dexron 6 (VI).
Dexron VI
Dexron VI
The latest specification automatic transmission fluid(ATF) for General Motors passenger cars and light trucks is Dexron VI as July 2014. Dexron VI is downwardly compatible to previous ATF Dexron versions.
Dexron (any version). Currently I think it's called Dexron VI, but it's compatible with earlier versions, but a 2006 or newer must have Dexron VI, not en earlier version.
4 bottles (quarts) of fluid. I have a 1999 XLS, & I recently changed transmission fluid. Transmission was drained with removing coolent connection etc. (complete removal). I Dexron VI can be used, instead of the original Dexron III (original fluid - again Dexron III was a cutting edge when 98 Avalon was released!). Dexron VI has many advanges over Dexron III. Consult a knowledgeable mechanic, & use the proper Dexron VI for your vehicle.
Dexron III/Mercon automotive transmission fluid (ATF) is generally recommended as a replacement fluid for automatic transmissions meeting original equipment manufacturers (O.E.M.) performance requirements for current General Motors, Ford, other domestic and imported passenger cars, vans and light trucks where DEXRON II, DEXRON II-E, DEXRON III, AND Ford/MERCON fluids are specified.Dexron VI is a partial synthetic which properties exceed dexron III by 100% in every area. Dexron VI can not be interchanged or repalced with DEXRON II, DEXRON II-E, DEXRON III, DEXRON-III/MERCON.
Dexron VI
dexron VI
Dexron VI
Dexron III is itself an hydraulic fluid. The issue is, not all hydraulic fluids are equal in quality. General Motors recommends replacing the discontinued Dexron III with Dexron VI
Dexron VI which supercedes Dexron III