Will do a double check on level, etc. I check occasionally, but don't differentiate between small change ... haven't seen change since last fluid change about 20K miles ago ... might just change and start over ... always looking for a reason to be under it.
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