I think there's an age related part to the equation as well as a service records and evidence of work done part to the equation too.

100,000 miles on a 1980s diesel with out service records is probably not going to be great
500,000 miles on a 1990s diesel with full service history and evidence of recent big repairs is probably a better bet

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1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!