Some years ago I owned a beautiful 1967 Hillman Minx in remarkable condition, that'd belonged to the late father of the chap I bought it from. It had 93,000 miles on the clock, all from that one owner.
The car came with a trunk full of brand new spares, but more interestingly a stack of notebooks that the owner had maintained - logs of petrol consumption, his own servicing (the car had *never* been serviced by a dealer) and the parts and consumables used, letters back and forth to the manufacturer, small upgrades to the mechanics and electrics, diaries of long trips taken in the car etc.
If I remember rightly there were about a dozen of these notebooks, and over the course of a few weeks I read through every one of them. I felt like I got to know the owner quite well, or at least certain aspects of him.
Owning and driving that car was a fascinating experience, knowing all of the history behind it