Fuchs Titan 4134 ATF backwards compatibility

[Jim Herold]

Is it advisable (or even preferable) to do a AT fluid change on a 1999 ML 430 with the 722.6 transmission using Fuchs Titan 4134 ATF developed for the 722.9 transmission? This would result in mixing whatever is left of the original ATF 001-989-21-03-10 with the newest ATF 001-989-68-03-10.

Any problems if I do this?

Any benefits?

Thank you--Jim Herold