Hi Road Runner

I have queried this a few times with various service agents and have ended up doing the usual and done a bit of research as I have a 200 series, same concern, just a different model.

The answers that I have gleaned is;

If the vehicle is used for normal operation, no towing, now off road driving, no low range no nothing else (which rather defeats the object of having the damn thing) then, your pretty okay and don't need to worry too much about it.

However,

If you do any of the above, it should be at around 80-100,000 k's.  However my take on this is, when I start noticing that the old girl is a bit slow to engage reverse (foot down nothing happens) and the shift pattern changes, then I'll have a look. 

http://www.lcool.org/technical/100_series/auto_fluid/auto.htm (I cant make the damn thing work, just copy it and paste it into the search bar at the top of the page)

Take a look at this from LCool, pretty self explanatory.  the fluid is WS ATF

Hope this helps

Mark

Hi Roadrunner, we too run the same set of wheels. I have my cruiser serviced by two young guys who used to work for Toyota before going out on their own. They told me that if you are towing a load like a caravan or so it's good to change the auto box oil every 100k. For them they have worked out what needs doing and when based on their experience. It may change a bit depenant upon how often you are pulling the van or similar. For me as I put it to them, I would rather over do it than the other way. Hope that helps.

Brian