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The 5L40E originally came with something similar to Dexron III, so it was likely much more viscous than the Dexron VI that most are currently using. I changed mine out with the MaxLife fluid which I swear used to be a bit more viscous than Dex VI. After I had changed it out, I happened to look up the specs and it now says it's actually slightly LESS viscous than Dex VI. Unless I'm mistaken, it appears they have changed the formulation sometime in the past couple of years resulting in a lower viscosity.
It seems to be working fine in my trans, so I'll leave it in there for a while, but I may try something else like the Castrol Multi Vehicle mentioned earlier at my next fluid change. I'm not in the camp of those who believe in old, contaminated fluid being the ticket to long transmission life.
AM.
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E70 2010 3.0 M57 AT Titanium Silver with Black Leather
E53 2004 3.0 M54 AT Toledo Blue with Gray Leather
E83 2008 3.0 N52 AT Silver Gray Metallic with Black Vinyl
E46 1999 2.8 M52TU 5MT Black with Tan Leather 250K+ miles (Sold, but not forgotten)
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02-27-2020, 08:20 AM
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