I decided 75k on an original engine - no obvious rebuild - but made the wrong decision (water jackets split - coolant etc...)
Obviously soooo much depends upon whether reg oil AND coolant changes (with phosphate free) have been carred out over 17 years - it is very much specific to any engine however.....in an attempt to understand what kind of mileage can be expected from an (at least) 17 year old engine.
In a (psuedo) scientific attempt to gather info.....
How many miles have you done on your original VW engine (or suspected to be original - check your V5 against the engine number - make sure it hasn't got a * at the end etc.).
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Engine Type: (e.g. DG, DJ, MV etc)
Year:
Mileage done: (ks)
Oil and Coolant Servicing if known: (e.g. FULL VW SH, Own changes for last 50k miles etc.)
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I will start

Engine Type: (e.g. DG, DJ, MV etc)
DG
Year:
1990
Mileage done: (ks)
86000 (then poooof!)
Oil and Coolant Servicing if known: (e.g. FULL VW SH, Own changes for last 50k miles etc.)
Unknown to 75k - then Oil/Filter ev 4k