auto gearbox oil change

[Mick]

has anyone noticed an improvement in gear changes after changing the gearbox oil,mine has done 65000 mls now so its due a change,but i am reluctant as the oil (texaco n940 fluid) cost £60.00 !
most other auto boxes just require topping up
why do our boxes require a complete oil change???
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Mick

[Mick]

have changed my auto box oil,it has made a vast improvment,gear changes much smoother now,and price of oil has gone down from £62.00 to £22.00 for 5 ltrs from Rover
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Mick