I am going to change me tranny fluid. I am pretty sure a non-WC T-5 uses ATF, but Ive had some people tell me that they have ruined a T-5 with ATF.
EDIT: And how much?
EDIT: And how much?
Ok I just found something that says 70wt gear oil is what should be used in a non-wc T-5.

Wait so stock is a WC T-5?
I always thought stock was NON-WC.
Sweet. lol
We keep overlapping in our posts.
You got it regarding the WC T5 part. Mercon or your favorite synthetic Mercon are the way to go.
If you have a little RTV at home you could drain the tranny from the drain plug...and just take off your shifter from the tranny and pour the fluid in thru there. Then use the rtv apround your shifter when you reinstall it. Yea its 4 bolts instead of a fill plug but its much easier if you ask me.

Through the shifter, FTW! It really does make life so much easier that way, as long as you don't spill the ATF all over the interior as I've come VERY close to doing once.![]()
And i feel its much better to do it from the shifter but you should have someome look under the car and be ready to put the fill plug back in once they see the tranny fluid start to spill out of the fill hole. I love these T-5's they are so easy to work on 
Yea they havent used NWC T5's for a while now. I learned that during my re-build. Use ATF as previously stated. I used ATF-4, Well because its free at workAnd i feel its much better to do it from the shifter but you should have someome look under the car and be ready to put the fill plug back in once they see the tranny fluid start to spill out of the fill hole. I love these T-5's they are so easy to work on
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Why would you need to have the fill hole open if you are filling from the shifter?