Automatic gearbox fluid change

[alphagemini]

I have a nice Mercedes C 200 with 36000 miles on the clock. It is due for a B service including a gearbox fluid change. I am told by an independent service firm that they rest the gearbox ECU when the fluid is changed. This is to remove the compensations generated by the unit as the fluid changes viscosity etc.. Mercedes say they do not do this because it isn't necessary, but don't tell me why. I have contacted other firms. Some say they do it and others say they don't.

What is the truth about this?

Any help would be appreciated

[Sardonicus]

Yes reset adaption values after the oil service

[helix402]

Sardonicus said:

Yes reset adaption values after the oil service

Ideally yes. But by nature adaptations will adapt themselves after an oil change on their own.

[Sardonicus]

helix402 said:

Ideally yes. But by nature adaptations will adapt themselves after an oil change on their own.

Yes but slower at times far slower do on the Beemer ZF stuff anyways

[Sheepshanks]

I've not heard of it being done routinely after an ATF change on a Merc (I'm a long time owner). The full adaptation procedure is really complicated - involves driving in each gear multiple times within certain rev ranges.

[Sardonicus]

Sheepshanks said:

I've not heard of it being done routinely after an ATF change on a Merc (I'm a long time owner). The full adaptation procedure is really complicated - involves driving in each gear multiple times within certain rev ranges.

If you want to drive with the old stale accumulated data i.e pressure values general mechatronic behavior etc that I may add will now have changed/shifted due to oil viscosity etc then go ahead I am only trying to put across my experience