Inverter coolant pump

[bwilson4web]

Originally Posted by wyatt

Interesting, I think we just crossed 115,000 miles, so the transaxle oil change would be a good idea... Are you proposing that we have a transaxle oil change date? Do both at the same time? I would be up for it!

In this HEAT! I'll be doing mine at the crack of dawn on Saturday or Sunday morning . . . or do you have an air conditioned garage? <GRINS>

Bob Wilson

[wyatt]

No air conditioned garage at my house... I would be up for an EARLY morning change, or if it really doesn't take too long, an early morning change (I don't have AC in my daily driver, so the heat isn't as much of a detractor to me). If my car would have to cool significantly before the oil could be changed, I would even be up for seeing how it's done.

[Daox]

What oil do you recommend replacing it with Bob? I haven't done this on mine either and I'm around 65k.

[bwilson4web]

Use the OEM Type WS, the Toyota brand. I've looked at different alternatives and even tested Amsoil ATF. Toyota Type WS has values more like aircraft turbine engine oil:
2003 Prius - Cold Weather and Transaxle

The last two columns are the Type W oil and the results from the first, 60,000 mile change. Since then, the owner has gone through two more and is getting much improved results.

The viscosity numbers at 100C and 40C are the tell of a quality oil:

24.6 cTs @40C
5.5 cTs @100C

I've looked and this stuff is great. Heck the Type T-IV (what I'm supposed to use in our NHW11,) wears down to the Type WS starting viscosity. But when Type T-IV has worn down to that level, it has become a 'lapping compound.'

Bob Wilson

[wyatt]

Do you have to go to a Toyota dealer to get it? I haven't looked for it before, but am assuming that it isn't available at Wal-Mart...

[bwilson4web]

Yes, Type WS seems to be only available from a Toyota Service Center. Double check with Hobbit's write-up on the amount for the NHW20. You'll also need a large, metric, hex driver.

Bob Wilson