As with Fatso I had mine properly flushed by the ZF agents in WA, Automac, cost me $1150 or thereabouts, I already had the metal sump.
The results were well worth it, transmission became as smooth as new an absolute pleasure to drive. I'll have it done every 50000K's now.
The idea behind the purge is to suck the oil out from the connection at the oil cooler and pump in the new oil at the same point thus replacing ALL the oil.
By emptying the sump and refilling it, all the old oil that is in the system is not replaced.
Well worth doing as a regular part of your maintenance
RichardK
Series IV Matrix Offroad Camper following our Discovery 3 with E Diff, BAS Remap, Mitch Hitch, Uniden UHF, Codan NGT HF, Masten TPMS, Proquip Compressor Guard, ARB Winch Bar, Milemarker Hydraulic Winch, 4x4 Intelligence Rear Wheel Carrier, VMS GPS with Rear Camera,
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