ZF is the manufacturer of the transmission likely used in your car. I base this off you having the same year & model I had (recently sold....still miss it!). ZF is a really good manufacturer of transmissions.

There may be some folks who feel you could use a different fluid than the ZF fluid, but my opinion on this transmission is to only use the Lifeguard 6 fluid, if your car has the 6HP26 model (I think that is the correct model, but don't quote me on that! It should be in the 6HP2X family.). The oil is not like typical red transmission fluid, it is yellow in color and much more the consistency of gear oil.

Have your mechanic confirm what transmission you have, and be sure they use the correct fluid. You are fine on mileage. 2 options, just a drain & fill or you could have them drop the pan and put in a new filter too. CTSC sells a nice kit to do the job.

Good luck!