I now own my father's "unbreakable piece of metal". It is a 1991 1HD-T 5 speed manual with over 560k km (350k miles).
He got it in 2005 with around 250k km.
The "maintenance" done was (2005):
- New OEM turbo
- Rebuilt diesel pump & injectors. (after this it had less power and its mileage...