the 236.10 datenblatt (data sheet) is old spec, you can substitute it to 236.12 which has FUCHS Titan 3353 ATF, it should be cheaper than OE mb fluid - which should be 20 USD/lit
the FUCHS should retail close to USD 10/lit - and you need about 8 litres, a new filter, pan gasket - if the connector sleeve is leaking you need a new one and make sure the electrics plate is good - otherwise you need to change that too. btw you need to get a dipstick tool or make one yourself to measure fluid level.
DO NOT UNDER ANY CIRCUMSTANCES USE DEX3 in it.
Be careful with the dipstick cover lock, dont break it, new one would be Rs 100 or something though.