Additives are good for you. In the case of diesel, it's the ones that keep the injectors a bit cleaner, and the ones that increase the cetane rating. If you keep your car a few years, never do more than about 75k in them, then it's fine. My cars go on for years and well into 6 figures, so having the engine as good as it can be is important.
My last diesel did 196k on a completely original engine and ancillaries, and I'm fast approaching 100k in the V50 with the engine in fine fettle. Each to their own...
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