I've recently purchased a 2005 D3 V8 as a second car to the 2014 TDV6
My experience so far has been that the 4.4L V8 seems very well matched with the 6 speed box.
I haven't seen anything to suggest the 6 speed transmission is any more "at risk" with the V8 than any other engine.
Water crossings of course always depend on how deep and for how long but are not generally a major risk if you stick to the wading depth of 700mm
Bigger risk is pressure washing the engine bay especially up around and behind the battery.
Basically just don't do it.
I'm interested to hear about any common V8 issues too.
I think maybe there's some plastic cooling components that are worth changing (similar to the TDV6)
Cheers,
Scott


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