How to replace auto tranny fluid

[bad]

Originally Posted by CTScott

You might want to take a closer look. The automatic has a dipstick. As for the changing interval - This seems to get discussed at least weekly here.

AUTOMATIC TRANSAXLE

Fluid capacity (drain and refill), L (qt.,
Imp. qt.): 2.5 (2.6, 2.2)

Fluid type:
Toyota Genuine ATF Type WS

Change automatic transmission fluid only
as necessary.

Generally, it is necessary to change
automatic transmission fluid only if your
vehicle is driven under one of the Special
Operating Conditions listed in your
“Scheduled Maintenance Guide” or
“Owner’s Manual Supplement”. When
changing the automatic transmission fluid,
use only “Toyota Genuine ATF Type WS”
(ATF JWS3324 or NWS9638) to aid in
assuring maximum transaxle performance.
Notice: Using automatic transmission
fluid other than “Toyota Genuine ATF
Type WS” may cause deterioration in
shift quality, locking up of your transmission
accompanied by vibration, and
ultimately damage the automatic transmission
of your vehicle.
Please contact your Toyota dealer for further
details.

I looked at the “Scheduled Maintenance Guide.” It never says when to change but it says when to check it. It says to check it pretty often.

I have 100K miles on my Yaris now. I bought it with 50K and don't know if the fluid was ever changed. I used the dipstick and saw the level was good. The color was purple, but a little dark. No metallic flakes or anything. I have no problems shifting (automatic).

Is it bad for the fluid to be a little dark?
Is there a good reason for me to change the fluid or even clean the filter and change the gasket as this website below instructs? (I know how much to use and to only use Toyota fluid.)

http://microimageonline.com/forums/s...ice-inspection