when you ask about the vin, what do you mean exactly... model? specs? identity wise?
vin plate is somewhere in the engine bay, usually by the firewall but can be on the strut tower and front section as well.
nah.... actually checking new cars and old cars are abit dif....
legend
+easy
++mediocore
+++hardcore
-interior
+check wear and tear on parts you touch, steering, gear knob, handbrake, seatbelt(usually this is the one nobody replaces), seats, leather trim, any leavers, carpeting and basically everything someone might touch , see if it matches the mileage (diferent materials wear at diferent rates, checkout other cars of similar mileages be sure)
+ofc check the specs to confirm trim level (cruise control, airbags) (double check online sources, and the actual trim level of the car, dealers like to mis-label their cars)
+check the electronics.... (as in test EVERYTHING, a-z, check if all door sensors work, boot light, basically EVERYTHINGGGG)
++stripsearch, look for stains under the trim at the sides and the bottom feet wells, also look for rust at the corners (this means pulling out the seats for the back and the mats at the bottom, but this is more applicable if the car is like 20 years old)(also helpful in telling if a car has been flooded before)
+odd stains, seat stains etc
*on japanese cars, the general year of manufacture can be found on the seatbelts (not sure bout potongs, never checked)
+++hardcore guys will check if the panels are the exact one as the ones that came with that car during that year (applicable to much older classics, or those who for some reason really want something specific)
-engine
+this one... u pandai pandailah, too many ways to check, many dif ideas
+no funny sounds, check if fluid levels are up, color all ok? (shops usually dah cover all problems here)
+leaks, they look damp or dirty (unfortunately i have seen cars pre and after masuk kedai, signs of leaks all missing and they start leaking again after you buy em)
+some have poop on the engine covers or anywhere in the engine bay/dark shaded areas, probably means that the car has not moved for some time, check harder now!
+ask bout belts, oil, tensioner, waterpump whatnot, all adds up
+bring any diagnostic tools you have, elm327's are fun toys that generally work.... its like 20 bucks online
++look out for mods.... (mods can be god, can be bad, for 2nd hand cars, best to be unmolested UNLESS its a setup which has been done properly and you particularly want)
++visual check for headgasket failure, check oil (should be clear and not milky), check radiator water under cap and reservoir, should be oil free no cloudy crap (brown water usually means some idiot filled it with water and its started rusting, depending on how bad, might be fine), start car with radiator cap open, there should be no constant stream of bubbles (smell bubbles, if exhaust, definitely needs a headgasket)
+++compression test
-exterior
+check for accident damage, search throughout the car!!!! look underneath, look at the sides, look at the front radiator mount/subframe with the bonnet open, any strange curves and its a sign the car has been repaired
+check for overspray, some fellas respray the cars to coverup damage some will admit resprayed, some wont (ask before vewing, pretend you dont know nuts, easier to catch their slipups)
+in the engine bay, u can find info on the car (from the plate, u can tell the vin, color, trim, some cases engine, differs from car to car, only applicable if the car has never been transplanted)
+check tyres, all same?(not same means likely kept on a budget) any bald spots?(means been sitting), wear rate same?(if no, alignment)
+lampu, craze, scratches, cracks, chips
+windscreen chips cracks
++some recommend bringing a magnet? never done this so ill just add it in but up 2 u
++jackup! see if bottom nais or not!, also helpful to find oil leaks~
-driving
+check steering ade veer to any direction,
+brakes ok,
+no funny sounds, some would advise you tekan abit to see if it does anything funny
+on performance cars, sometimes its a good idea to test if the 'performance features' work as expected, ask the owner to drive you for this part to be safe (things like vtec/mivec engaging point, turbo spool point, whatnot blaba, can tell you alot about a car, if you have a diagnostics device, even better)
remember take your time~~
not sure if i missed anything