automatic gearboxes

Your car's owners manual... Someone here would tell you, but we don't know what kind of car you have.

Year, make, model, engine?

Generic automatic transmission advice follows:

The minimum service you should do is to drain the pan of the transmission at every 30,000 mile major service, change the filter if your car has one, and refill with the fluid specified in the owners manual - that changes out about 1/3 of the fluid volume, enough to refresh the additives.

More often if you drive really hard or tow a trailer. And if you tow, make sure you have an auxiliary transmission fluid cooler, the one built into the radiator is not enough for severe duty.

You can not change the fluid contained in the torque converter unless you take the entire transmission apart - but you can flush it out by circulating fresh fluid with a flushing machine connected to the fluid cooler lines with the engine running. (For every liter of old fluid that comes out of the cooler line, it pumps in a liter of fresh fluid into the return line. When the old fluid coming out of the transmission starts running clear red, you are done.)

The full flushing service is only necessary if the transmission has been badly neglected or abused, and the fluid is black and burned. It may save you from doing the rebuild work for a few more months.

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It's an aisin (toyota owned company) 5 speed used on Renault Espace or Vel Satis. The manual said "no servicing" and I can't belive that... The engine is a 3liters V6 diesel from Isuzu (GM)

By

Don't know about the model you have BUT the cost of a flush/refill is just a whole lot less than a transmission.

If the fluid looks and smells okay you can probably just drain/refill at first service - I believe in a flush at second change (60,000 miles) of everything.

spending 5-600US every 4-5 years to keep a 30,000 vechile running a few years seems cheap to me.

You might try on the website for better info?

Ron