For second hand cars, here in Australia we have a youtuber that goes by the name ReDriven, this guy Adam reviews second hand cars specifically and focuses on reliability, and what it's like to live with. He's got a mate who's a mechanic that details all the specific mechanical problems that they see with the cars.
Such an insanely useful little channel and they do amazing work.
Such an insanely useful little channel and they do amazing work.