Easy choice if it were me ...

Change fluid and filter ...

Return adjustments to where they were ...

Bottom line - why would something change simply because of a fluid change unless something was messed up?

__________________
George Stephenson
1991 350 SDL (200K and she ain't bent, yet)
former 2002 E320 4Matic Wagon - good car
former 1985 300 CD - great car
former 1981 300 TD - good car
former 1972 280 SEL - not so good car
a couple of those diesel Rabbits ...40-45 mpg