Mb 236.6 atf9/23/2023 ![]() I am now using D4 or High Temp in all my cars. DO NOT use Red Line D6, which is the lower-viscosity Dex-VI. Red Line D4 or High Temp are the Dex-III replacements which will work well in a 722.3/.4/.5 transmission (the D4 can be used in the 722.6 as well). The old Red Line Dex-II formula is no longer available. The newer stuff is not always better!Īgain, this is for newer MB transmissions, not our 722.3's in the 500E, but you get the idea. They recommend thin fluid for fuel economy, which is not my priority. MB says the thin stuff "should be used", but I don't agree. 10 spec was for a normal (thicker) viscosity. ![]() 14/.12 spec is a low viscosity fluid, while the older. ![]() For the newer 722.6 transmissions, MB says the latest fluid (236.14) "should be used" for older applications (i.e., early production 722.6 in the late 1990's) that originally called for for 236.12 or 236.10. Watch out for that "should be used" and "can be used" thing. I found this good info posted elsewhere but would like to know what the BITOG members suggest. It sounds like the current widely used standard isn't technically ideal for this older auto 'box that isn't computer controlled. Can anyone suggest a correct synthetic ATF for '90s era Mercedes-Benz 722.3 4spd automatic in a 500E?
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