Not sure how to check on your 740...does it have a tranny dipstick???
Anyway, need more information regarding your the fluid change. If it has never been changed at 165k then you are about 2 or maybe 3 changes behind. If it was changed less than 60k miles ago then I would say you are ok, but coming up on another change.
Tranny changes should be about 60k to 80k miles, but check you owners manual.
2002 BMW 330XI
1988 Porsche 944