Subaru fluid only from dealer. Cost is about $8.00 / qt and you need 4.5 for drain and refill or 14-16 to completely change it.
The recommended automatic transmission fluid for a 2000 Subaru Outback Legacy is Subaru ATF HP. This is a proprietary fluid which is sold by local dealerships.
There is a diPstick at the front on the transmission differential
A 1996 Subaru Legacy Outback requires: For automatictransmission: DEXRON III For manual transmission: GL5 75W90 gear oil
The manual specifies only Subaru fluid. If this is not available Dexron III can be used until Subaru fluid is available. Noise and hard shifting will be the result.
EVERY 50,000 KMS.
dexron III is recommended for a 2003 Outback automatic
Pull the dipstick out, put a funnel into the tube where the dipstick was, open transmission fluid container, pour.
Transfer case is lubricated by the transmission fluid.
Dexron II or Dexron III type ATF.....
Subaru recommends to use GL-5 (75W-90) Transmission Gear Oil.....
Inside Transmission. Drain fluid & remove Oil Pan for access.....
Transmission fluid on any automatic transmission is filled through the dipstick tube. You will be more successful if you buy or borrow a funnel with a hose on it made for this purpose.