drain oil and drop sump first and check to see how much crap is floating about in the gearbox !

if its okay then you can put the old oil back in if you want to and save spending out on new.

but i wouldn't go changing the cooler or anything else until you know the state of the box first
 
if going down the oil change route would it be worth putting something like lucas autobox additive in oil
i have done this with other cars before with reasonable results
 
if going down the oil change route would it be worth putting something like lucas autobox additive in oil
i have done this with other cars before with reasonable results

I wouldn't put anything else other than the recommended oil in these boxes !

The oil is specialised enough as it it, hence any old transmission oil won't do.
 
Doozels before 2005 were all GM boxes...

Petrols upto 2006/7 had the ZF 5HP then the 2006 Doozel and 2007(?) Petrol had the ZF 6HP
 
Your breaker doesn't know what he is talking about...

The Diesels had the GM Box up to 2005/6 and then the ZF from then on....
 
pulled the bottom off today
a mass of swarf and metalflake
the box itself looks like a recent recon one.took the block off and cleaned it out the oil in there was not too contaminated.
however took the oil cooler off and it was virtually blocked with metallic particals.
dont know if the box was replaced and the torque convertor was nt or the oil cooler wasnt cleaned.it didnt appear to ever have been removed.
there appears to be a slight drip coming from the torque convertor area and there was nowhere near 10l of auto fluid drained from system,i would guess around 5/6 l in total.
 

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