Comment by phatfish
My dad would always buy a "Hanyes" manual for our second hand cars in the UK, as inevitably there would be something to fix. These were comprehensive 3rd party manuals.
I have also gotten them for newer early 2000s cars. Never had to use one for my 06 Vauxhall though. Apart from some standard things that really need a repair shop (replacing the exhaust for example) I've never had an issue or breakdown.
The cars I see on the side of the motorway are always new, feels like there was a period before electronics really took over that most cars were pretty bulletproof.