Look for water leaks from the water pump housing and the front-passenger-side of the block. The 300Tdi can easily warp heads and manifolds if it's been cooked, and they can have cracked heads without any real outward symptoms (these can let you down in the middle of nowhere). Having said that I drove 8000km through NT and western Qld with mine cracked and I just made sure I filled the water every morning.
Apart from that both of mine have been brilliant cars.
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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