I'm pretty sure they wouldn't be happy in a mud hole up to the bonnet... In fact from a recent thread I read in this very section of the forum, it wouldn't like it at all...! I once got my D1 bogged in this situation, winched it out, checked the oils which were clean and drove it home and re-greased everything 
 
 
I'm sure some smart arse will be along to remind me that I drowned my D1 in 300mm of water (I'm quite sure the engine bay was well and truly full though, as i was being a bit of a ******), however I'll point out that that was user error and mechanical neglect that let the water straight in, it wasn't because 18 computers had a brain fart 
 
 
I think it's foolish to think a modern car could put up with the punishment of an older car (talking stock vehicles here).
And just to make sure it's understood, I'm not talking about perfect scenario capability, I know a D3/4 is more capable offroad, when it's all working properly.
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