Transmission Drain and Fill Question

Yes, virtually all the ATF drains out, the drain plug is at the bottom.


Remove the fill plug first! You would hate to have it empty, then discover you could not fill it.

Here is one opened up, you can see the remaining fluid is minor.

 

Yeah as far as I know, most of the fluid drains. I'm looking through 2007 Owner's Manual pdf, was hoping it'd show both the drained and overall volumes, but no such luck.. That's my take though:

You've maybe bought 4 quarts too much, lol? I don't know what I'd do. Considering it's likely never been changed before, maybe do the second change not that far into the future, say in a year. Just so you're not sitting on the stuff so long.

I've found the most important change is the first one: subsquent changes, the fluid looks more and more indistinguishable from new.

Do have the car level when filling, and just fill till it starts coming back out. That's the key to correct level.

 

Changed mine 3 times. Very easy.

There’s a small amount left in the fluid pump galley. There’s a pump and a small inlet filter that cannot be serviced without trans disassemble.

My observations and having done a trans UOA is your one trans fluid change should be good for the life of the trans. The majority of wear happens at the first 5000 miles of life during break in.
Tracking mine over 100000 miles and changing I it 3 times showed really no wear after that initial change. So your done. Sell your WS.

Now what’s even more important is the inverter fluid. I always change my inverter fluid when i did my trans. Super easy to change. Super important.
That’s the trans and inverter coolant. Also you will see a increase in mpgs
As inverter will run cooler.

I also clean the under dash ac ecoil when I do the trans and inverter.
The hard part for me is jacking the car up. I make the most of it.
Buy Koolit on amazon. It’s a cleaning kit for ecoilsl

Also no reason why you should let yur car rust away. Buy CSP at Home Depot and hose the suspension down. It will stop that rust in its tracks.
Great product, not one thing rusted on my car undercarriage.
Used it for years on all my cars.

 

Cool. Your good to go for quite a long time. Keep an eye on the engine oil some Prius eat oil.
Check the oil level first in the am before starting the car. That will give you true oil level.
If you pull 8nto gas station and check the oil it will show it’s quite a bit low as a lot of oil is up in the VVT valve section of the engine.
Takes a long time for it all to drip back. Keep the oil at the full line.

My car is at 115000 miles I still check th3 oil once a week on Saturday. I bought it new 10 years ago,

Engine takes 3.6 quarts with new oil filter. Use oil filter from dealer last I checked was $4.50.