The Owner's Manual has maintenance schedules.
If you are at 60K miles, I'd change ALL the fluids. Transmission (and clutch, where applicable), differential, power steering, and brakes (did I miss any?).
A visual check of lube condition is not very accurate. If you are not having analyses run, change frequently, based on miles/time/type-of-driving.
I'd be willing to bet a substantial sum that they didn't check your trans or diff fluids at all.
As per G37Sam, the Z is pretty reliable, but, as with all mechanical things, improper maintenance will greatly decrease reliability. Frequent lube changes is part of proper maintenance.
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