All I can say is that my 2010 D4 has required a huge amount of expenditure at around the mileage you are contemplating. It drives perfectly but all wear items are gradually being replaced since about 200,000km. Everything from the transfer case to the turbos and the inlet manifolds to the turbo pressure pipes and tail shaft has been replaced over the last year or two, not to mention normal items such as LCA's and suspension struts.
My transmission gets serviced every year before each remote trip (about 30,000km intervals) and is going fine so far, unlike most unserviced transmissions that I know of. I am bracing for it to fail as well soon, although there is no sign of trouble and no issues when they pulled the pan off to change the oil a couple of weeks ago! My car has been used for heavy towing before I bought it and lots of towing and remote very rough road touring and off roading since I have had it. Its only use now is as a remote tourer towing 2.2t most trips, so it hasn't had an easy life. Hence, I expect to replace stuff and must preempt any failures where possible. The only reason the transfer case was replaced was because it had some slight movement in the input shaft bearing and we do remote trips. For normal use I wouldn't have worried about it.
				
			 
			
		 
			
				
			
			
				Bob
2010 D4 3.0TDV6 SE, ediff, LLAMS, 5 x GOE wheels, LT285/60R18 BFG K02's, GOE Compressor Guard, LR Tank, Mitch Hitch, ECB Bull Bar, Kaymar Rear Bar, Traxide, Safari Snorkel.
2019 Discovery 5 SD6 SE, 20 inch wheels, 275/55R20 Nitto Grappler G2 tyres
			
			
		 
	
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