Not the tranny fluid...the rear differential fluid. We have an AWD, so maybe that has something to do with it as well...
Just did a quick search on it and it seems that they're actually likely being legit. The price to change it is too high, but I'm seeing every other oil change or so, you want to change it out. It flags an engine code (B16) when it's time, and my guess is that's what they saw in the computer when they did the inspection.
