Date registered: Aug 2008
Vehicle: 2002 ML270 CDI
Location: VIC, AU
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Well I changed the ATF and filter today, with MB 236.10 @$25/l (about USD$20/l at time of writing). The 236.12 fluid is $46/l so there is no way that is ever going to happen. I didn't even bother asking about 236.14.
I only changed 4l since my plans to flush the transmission at the cooler were thwarted when the thing I thought was the trans cooler actually had coolant in it instead! No idea what that cooler is for - looks exactly like a trans cooler sat in front of the intercooler, anyway.
The ATF that came out was a very dark brown colour. The pan looked pretty clean though. So I will let the new 4l of fluid do its job for 15k and then drop another pan-full (I bought 8l) and then leave it at that.
Thanks again everyone for all the help.