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Transaxle oil study report

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Posted by bwilson4web on June 4, 2011, 7:28 pm
I've been conducting a Prius transaxle oil study over the past six
years and just posted a summary report:


"Early transaxle oil change - a new car should have the transaxle oil
changed early with the first engine oil change. This will flush the
early wear material and loss sealant bits.

NHW11 - should use Type T-IV over Type WS as the wear patterns suggest
the lower viscosity losses may be more than offset by higher wear,
an early change and then every 30k miles.

NHW20 transaxle oil should be changed early, at 60k miles, and then
90k miles thereafter.

Use of a transaxle heater to bring the oil closer to operating
temperature should receive equal weight to an engine block heater in
colder weather."

Bob Wilson

Posted by liu on June 8, 2011, 2:55 pm
I have a 1994 Camry that never had the transaxle oil changed and it's
still working. Is there a concern in the future?

Posted by News on June 8, 2011, 3:16 pm
 On 6/8/2011 10:55 AM, liu wrote:

Undoubtedly already a concern, at your dealer or service shop...

Posted by bwilson4web on June 9, 2011, 3:25 am
I had a 1991 Camry before an accident led to it having the title
pulled by the insurance company. It was a solid, 32 MPG car and I
would still be driving it but for the accident. But once I lost it,
the replacement was our 2003 Prius.

Our 2003 Prius gets 52 MPG, dawn-to-dawn and like the famous heroic
pig with the wooden leg, You don't want eat him up at one time:

We have to use our 2003 Prius but we don't want to use it up too
early. <GRINS>

Bob Wilson

Posted by Leftie on June 12, 2011, 1:04 am
 liu wrote:

    If you had the transmission fluid changed, there is some exchange
between it and the transaxle/differential, through a baffle.

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