I dont know if you interested but here are some of my tips for extending the life of a "rough" diesel, I put about a quart of ATF in the oil, for a few hundred km so that its fully circulated in the system. I do a lubro moly diesel purge. I also decarbonize the engine by useing a water spray misting bottle and spraying water into the turbo while the engine is running at 2500 Rpm for about 5 minutes. Once thats done I run a 5W40 sythetic oil. I personally have had good results with this technique.

Using water to decarbon the engine is a very old technique, Use your best judgement and dont hydrolock your engine.

After these steps, I noticed much smoother running, much easier starts, better power, and less smoke.

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1984 Euro 300SDC, (4spd standard)
1986 Toyota Landcruiser Diesel HJ60 5spd X2

Gone but not forgotten (some sold, some stripped)
1983 300 SD, 1985 300 SD, 1983 240D, 1986 300 SDL, 1985 300 SDL, 1983 300 D, 1984 300 D, 1985 300SD, 1987 300 SDL, 1983 300 SD, 1985 300 TD Euro, 1983 380SEC, 1990 300 D, 1987 300D, 1982 300D, 1982 300D, 1994 E420, 1987 300 TD, 1987 300 D, 1984 300 D