ML Triton Oil leaks

Was just hoping someone may be able to help diagnose the possible source of these leaks. I'm away from the car and unable to get it to a mechanic yet but I'm also hoping I can sort it out myself.

The pictures are definitely not the best.

Car was given a quick spray with pressure washer before photos were taken, some spots appear wet but it's water.

2009 ML Triton, 4M41 3.2L Diesel Manual with Super Select.

Album of roughly 50 photos - https://imgur.com/a/E2J7sr0

There was a layer oil (maybe from excessive blowby?) all over the intake side of the engine beginning at the hose to the throttle body. Covered the common rail(?) all the way down to top the front diff.

And underneath there was a layer all over the transfer case from top to bottom. Mostly bottom. A little from the top area where the 4wd selector pokes through, not really on the tailshaft and no "ring of oil" around the area above the rear output seal that I've seen can be common. On top of gearbox was just dirt really, seemed pretty much all centred on the transfer case.

Car runs fine except for big vibration cos the mount for the t/case is completely stuffed. Changes gears fine, no strange noises, maybe a little rough but not certain tbh, not too versed in diesels or 4wd

I tried best to describe the photos in the album, can answer any questions

Next weekend I do plan to degrease the hell out of it and go for a drive for an hour or so and check again, I'd just like opinions on where to look first.

Thank you