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i changed mine when i did it, only because you can pour it in when the shifter is off. my car had about 63k when i did it so, im thinking it was about time. i put in 3.0L(3.2quarts) of mobil 1 synthetic.
They only highly suggest it since it is very easy to pour it in through the base of the shifter.. and most people can drive a car its whole life and not change the fluid..