It's burnt. Quit street racing or hot rodding it you dubmf**k. Also, get it changed and get a shift kit to pro-long your trans life.
For a 2006 Subaru Forester, you should use Subaru's own ATF (Automatic Transmission Fluid) or an equivalent high-quality fluid that meets the specifications for Subaru's automatic transmissions. Typically, this would be Subaru's ATF-HP or a compatible fluid that meets the JASO 1A standard. Always check your owner's manual for specific recommendations and ensure the fluid is suitable for your transmission type.
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.
You hit something and busted it open
yes it would cause the gears to slip more or less
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.
The most likely cause would be low fluid level.