Lohus

How often do you change ATF in IS250 transmission?
My local dealer said that it needs to be changed every 40 tkm. What do you think?

MrHarris

iTrader: (1)

I would like to know this as well!

A/C

I bet it was a russian dealer

Manual says no oil change provided, and knowing people say that complete tranny oil change is also impossible.

Here's a recent thread
https://www.clublexus.com/forums/is-...-problems.html

Kurtz

iTrader: (1)

Yup... the US manual (and most others AFAIK) all state the transmission is a sealed unit never requiring service, and it's not physically possible to change out all the fluid.

Even dropping the pan will only get about 15-18%% of the total volume out of there.

sinister2c

I saw this machine that they had at a shop that plugs into the two hoses that go from the tranny to the radiator to cool the tranny fluid.

I am not sure if the IS has these hoses (im sure it does because every auto tranny i've seen on other cars has this) or if you can flush and fill using this machine to change the fluid.

ISBU

^^^ Just make sure that they use the right trans fluid when they do this, otherwise you are going to damage your trans with the wrong fluid.

Regular maintenance is not required on this trans.

Kurtz

iTrader: (1)

You shouldn't be so sure.

If you disconnect those radiator-to-transmission hoses on a 2IS the only fluid you'll find in them is -radiator fluid- not transmission fluid.

carchitect

iTrader: (1)

It is due for change about 100K miles.

maxnix

Depends how long you want your automatic transmission to last.

OEM and dealer look at it as a very profitable to replace wear item.

Drain and refill won't cut it as the vast majority of the worn and contaminated fluid remains.

www.bgfindashop.com

Adding a real auxiliary ATF cooler rather than the factory ATF heat absorber couldn't hurt either.

Kurtz

iTrader: (1)

Can you explain -how- to do this, since the manual, lexus.com, the diagrams from TIS, and everything else we've seen, all suggest it's not physically possible to swap any significant amount of the fluid out, and that the system is, by design, not to have its fluid changed?

If it IS possible I'm sure a lot of people would love to know exactly how.

mvlbr

That's exactly what my service rep told me.

blk250

iTrader: (3)

+1...wanna to know too ; please share the infor.