3309 is NOT the holy grail.
At 190000km the car was undriveable, even after spending big bucks on 3309 for each flush.
In my V70T I've been el cheapo using Valvoline multi purpose tranny fluid from Bunnings and it runs better than new now.
But thats also after changing the B4 cover and replacing all the solenoids using an american solenoid kit. So I cant say with absolute certainty that its running better because of the servo kit or the cheaper fluid. But 3 years and 40000 km later the car is still running better than new.