gen4 - oil dripping from kingpin

Now we know it has been in an accident severe enough to bend the hub, I'd say it is only the axle oil seal that is leaking and the bearings are probably ok.

This may be because the axle tube is bent pulling the halfshaft to one side- as Martin says check it for straightness or it might be that while the hub was bent the halfshaft wobbled about and wore the seal out.

Find out what it is first, if the axle tube is bent it can be straightened (or replaced), but you will have to take it off to do a proper job.
In The Olden Days LandRover did a tool for bending their axle tubes in situ, but this was for correcting steering geometry, and I've never seen one in real life, only in a Series II workshop manual.

 

The inner seal to the diff was the culprit. The axle is fine, looks suspiciously like new. We suspect the previous owner replaced it after the accident. I can't understand why they didn't replace the €4 seal too... We also changed the outer knuckle seals, overall €25 for parts. Hopefully we won't be leaking anymore


 

I'm feeling the optimism however a long time ago my dad was driving dreadnought when some born again biker decided to slide a 750 under the sill and then back axle. Didn't noticeably touch the front axle but it did very nearly put it on it's roof. The insurance did finally get the repair right after far too much noise but unbeknownst to everyone the force of nearly tipping it over and the subsequent landing did a number on the kingpin bearing seats on both sides enough that it failed it's first mot at 3 years old and every year after that I had to replace them until eventually it became apparent that the seats were oval and wouldn't hold the bearings which allowed them to move and make everything worse. My point here is just because the axle looks good doesn't mean it actually is and not fully knowing how violent the collision with your car was leaves room for problems to hide.

To elaborate, this is why I think the axle was replaced. It looks like the tunnel was severely bent, then repaired, probably by cutting and welding... I doubt the axle survived that. The kingpins are fine, we've checked them and they provide the necessary resistance to avoid death wobble and indeed, the car runs straight under acceleration and braking without pulling or wobbling with speeds up to 140km/h.



P.S. 24 hours later, there are still no leaks, so that's solved I guess.