My 300Tdi has just passed the 275000 mark and still goes very well. No sign of oil usage or being smokey. I have had the leaks - front oil seal on the cam went, manifold water gaskets, etc, but nothing major. Whenever a leak problem happened where a modified replacement sorts out the problem permanently I've had it installed and there's no more problem.
On the other side I've owned a Defender with a 300Tdi which was really badly treated by its former owner and it did have odd problems. Had to do the head gasket and shave the head to get it to stop leaking water. If you find one that's been overheated then you'll probably have problems.
Norm
2011 D4 TDV6 (Audrey)
99 Defender 130 single cab ute 300Tdi (Mabel)
99 S1 Disco Tdi (Grumble)
-ex 97 S1 Disco V8i (Beast)
-ex 94 Defender Tdi (Antichrist II)
-ex 98 S1 Disco Tdi
-ex 78 Strangie (The Bucket)
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