I have a 95 burb with a 6.5 turbo in it. The PO replaced the engine to the tune of $10K but the later engines (599) blocks are more reliable. That said I have seen many mid 90s Gm diesel burbs and trucks with new engines around 250K , after which I think they are fine for quite a while. The 6.2s are more reliable but they are quite under powered. I had an 85 chev 3/4T 4x4 which was slow but really cheap to run, I regularly got in the 25 Mpg (imperial gallon) range. with that. Pretty close to 1100Km range in town more on the highway. My 85 was a standard but the autos 700R4s were prone to failure but not as expensive to fix as the more modern 4L80E . Some had Turbo 400s behind them which were terrible for mileage but never broke. Long and short with 49K on it if it isn't too rusty it is worth considering.

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It's always something simple
91 300D 603.960 (from japan) 194K
92 Toyota Diesel Landcruiser HDJ81-t 116K
02 Golf TDI new head courtesy of PO
87 300D
97 BMW 525 TDS Wagon 5spd
bunch of Onan and other diesel generators