I'm seeking to open discussion about which Transmission fluid to use.
My SRT6, 5-speed auto has done approx 133,000 kms (approx. 83,000 miles) and I am wanting to change the filter, gasket and Transmission Fluid.
I understand it will be costly to flush the whole system so thinking to just drain the pan and top up what has drained out.
I understand these transmissions take 8L and when you drain the pan you only get approximately 5L out.
So, I was thinking to just put back in the 5L of transmission fluid, but which type?
According to the specs the Transmission fluid should meet MB 236.10 and/or MB 236.12.
I would like to put the same stuff back in as it will be mixing with the old.
Problem is, I rang the local MB dealer and they only supply the latest MB 236.14 and they say it should be OK but upon doing further research I found that the MB 236.14 is more "slippery" and designed for the 7 - 9 speed boxes.

What have other XF brothers and sisters done in this case?