Do all your other cars call for the Esso LT spec fluid?

My only issue with the D4 is that it is a generic fluid claimed to be suitable for all automatics (Dexron, Esso LT, Ford Mercon, Honda ATF, etc) and also used as a gear lube in transaxles. It isn't certified to any of those standards, that is just Red Line's marketing claim.

I think that the reason there are different specs is because different fluids are optimized for each different application. ZF, GM, and Ford even use different fluids in different designs of their own transmissions. Using one fluid in all of those applications (including using D4 as a gear lube) seems a pretty low-tech approach. Just my $0.02

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue