Change automatic transmission fluid

[cng]

I have a 94 E420 with automatic transmission. I would like to change the fluid but I do not have the right tool to take the drain plug out. None of my metric Allen style hex wrenches fit. Can someone tell me if this is just a simple metric Allen style hex plug and what size is it?

I try to use a vacume pump to suck the fluid out of the transmission, but I was only able to get one quart out with the pump.

Thanks

 

[JimmyTD]

It's no good using a vacuum pump, it wont remove all the fluid.

You also need to remove the sump, change the filter and sump gasket and drain the torque converter to do a proper job.

As far as I can remember the plug is a standard size.

 

[Andy]

Hi

The torque converter allen key is 5mm.

Regards

Andy@ www.mercedesservicing.com