There is no gauge according to your owners manual. As such you would not know if it needed fluid so adding fluid would not be wise. Service is done by the Subaru dealer. Good to have one less maintenance item, isn't it?
I'm going to refer you to this. http://wiki.answers.com/Q/What_would_be_the_cause_of_transmission_fluid_to_turn_dark_in_a_2007_Subaru&updated=1&waNoAnsSet=2 Happy reading.
Automatic transmission fluid would likely cause a standard transmission to overheat and wear the gears at a high rate.
Not changing the transmission fluid in a car within 200K would cause problems.
The most common cause for a transmission not to change gears, is low transmission fluid. Check the transmission fluid and fill to the full line.
Stripped transmission, low transmission fluid.
yes it would cause the gears to slip more or less
You hit something and busted it open
Leaky transmission lines would cause the fluid level to drop and eventually cause the transmission not to shift and go.
Your motor oil going bad would cause that. That is in the crankcase, not the transmission.
1. Low transmission fluid. Check this first. 2. Old transmission fluid and clogged filter. 3. Worn clutches inside transmission.
The most likely cause would be low fluid level.