transmission and transaxal fluid changes 2010

Welcome to PriusChat:welcome:

Prius doesn't have Transmission fluid; it's called Transaxle fluid and shouldn't need changing until mileage is 100K IMO. This link from PriusChat talks about transaxle fluid in the Gen 1/Gen 2: http://priuschat.com/forums/generat...d-change-120k-miles-what-transaxle-fluid.html

 

Please let
Toyota know that they are calling it the wrong thing


Most transaxles of all makes use transmission fluid.

Oil analysis by some PCers has also shown that the initial fill Prius fluid is in pretty sad shape by 60k miles and should be changed around 30k miles the first time.

Also see attachment

 

Good catch, but the OP assumes two seperate components and fluids. I was trying to make it easy to understand. My bad...

 

The transaxle fluid drain and fill bolts are on the passenger side (right side, as you sit in the vehicle) of the transaxle. The fill bolt is just back of the right side drive shaft as it comes out of the transaxle. Relative to the fill bolt: the drain bolt is down maybe 4~5" and toward the front ~2" (almost at the bottom edge).

Both are round headed bolts with 10mm hexagonal sockets*, and have a washer that should be replaced. They're both on the right sidewall of the trasaxle. In a pinch you could re-use the washers, especially the top, fill bolt, I think.

(* In comparison: Honda automatic transmission drain bolts are similarly round, but with 3/8" square sockets. Very handy: any 3/8" drive socket wrench works. Also, at least with any I've worked on: there are dipsticks, and fill is through the dipstick hole.)

To access these bolts you can just open the plastic flap** that is used for engine oil change access. It's on the right side, and has 3 push-in plastic fasteners needing removal. One of those fasteners is different than the other two, so worthwhile to mark it's location.

(** I would be very gentle with that flap, opening it just enough for access, maybe securing it in opened position with string. There are numerous reports of this flap cracking/breaking.)

To fill with fresh fluid from above you will likely need a funnel with at least 3 foot of hose. I'd start with a brand new funnel and hose, and use it only for ATF-WS use, to avoid contamination.

Some spec's:

Drain and fill bolt torque: 29 ft/lb
Refill qty: 3.3 liter, or 3.5 US qt
Refill guidance: Add fluid till it starts coming out at the fill hole (with car level).
Level check: 0-10mm below lip of fill hole***
Fluid: Toyota ATF-WS

(*** I would suggest pouring in 3 liters relatively quickly, then maybe getting an assistant to very gradually pour the remaining 0.3 liters, while you monitor level from below, until fluid starts to trickle back out.)

 

Is it true that transaxle fluid Toyota is really ENEOS?
If this is true, ENEOS has to offer a new version of this fluid - ENEOS ECO-ATF: Nippon Oil | ENEOS ECO-ATF

 

Eneos claim is that it is compatible with Toyota WS, no where do they claim that it is suitable for a Prius transmission. There is a big difference between being compatible with another lubricant and being a replacement for a specific application of that fluid. What is your connection with Eneos? A high percentage of your posts are pushing Eneos.

 

Looking for my Prius has the best oil and transaxle fluid.
New products appear to ENEOS company one of the best.
I just want to know yours opinion.
I have lost confidence in Toyota authorized service, which claimed that the oil 5w-30 is suitable for my car.