My Defender 110 tdi has clocked 300 000 kms. I have now changed the oil more that 50 times, the cambelt 4 times, etc. The engine still starts fine although I own all the parts for a full overhaul. I'll wait until the compression goes or it starts using a lot of oil.
And in this time, apart from 'service parts' I have changed the rear wheel bearings (self-inflicted), blown 2 alternators (caused by a short of sorts in the cable) and one UJ.
I also changed the rings and big end bearings at 160k after a disastrous experience with a K&N non-"filter".
All the cooling system is still original including the hoses.
Yesterday one front hub cap (those placky things) broke and flung grease all over the front wheel.
Turbo is original, possibly helped by all the oil changes and an EGT gauge so that I never switch off until the temp drops to 200c
Happy Days!