Anything over 100k i struggle to sell.
Over 100k is high...120 to 150k+ is where you can expect major problems with a car...
Gearbox, pistons, top end, bottom end, oil leaks ...Thats the point where you decide whether you scrap it or spend tons of money on it...
Before trade days i bought a 56 vectra with 113k... Replaced flywheel at 140... 146 the gearbox went! Had good service hisrory and that but service history means peanuts unless major components have been changed