just my 2 cents worth, not all are like that though,
assume the second hand dealer tempers with the odometer, which will
reflect low mileage (not all are like that though), you will not be
able to tell by just reading from the meter on mileage, then gotta
look at tell tale signs.
experts will be able to tell more. i am just a layman but got some
experience.
i kanna one second hand car, at first it was ok, then when i
travelled up north, the engine oil dried up pretty quick. found out
the piston was already worn off after thorough checking, and the
engine block has hairline crack which symptoms would only show
under thorough test. from then on the car spewed thick white
smoke.
dealers are good at hiding flaws and refuse to take responsibility
later, or make it difficult for you to come back at them.
another dealer bought my this car and is putting it up for sale
again, i wish the innocent buyer good luck.
other wear and tear can be spotted by experience eyes, get help
from experts if you wanna buy one.
seriously consider new ones if you can afford.