Land Rover diesels are capable of 200-250,000 miles (or even more) if maintained well, so 150,000 is nothing unusual, especially since you won't be working it hard through mud in the tropics or any other kind of 'abuse'. As you say, "if it isn't broken, don't fix it".
BUT- 150,000 miles is generally when the top end of the engine starts to get a bit worn- especially the valve stem seals. If your engine starts putting out blue smoke at start-up (as well as the normal puff of black), then the seals have started to give. This is not a serious problem- the blue cloud will gradually get bigger and bigger until you start losing noticeable amounts of oil- in which case fixing is a simple cylinder-head-off job. My Diesel Turbo engine is approaching 150,000 miles and is going to need this job doing- the smoke-clouds have reached epic proportions.
Also, some 300Tdi's lose their cylinder head gasket around 150,000 miles (often between No.4 cylinder and No.8 pushrod gallery), which will eventually cause failure.
The only other things that could be done is having the injectors checked, adjusted or replaced, as they could be starting to gum up as well.
If you want to be 110% sure of the engine's condition, you can check these items.
However, if the engine starts and runs well, isn't losing any oil or water, isn't smoking more than it should and their isn't any heavy breathing out the oil filler cap (a symptom of bore-wear), I would just leave it alone- there's a very good chance it will keep working hard for years. Just keep up the maintenance.
Jack
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