Take someone who knows a bit about motors with you,when i buy a motor i get them to drive it to anywhere with a ramp(kwik fit&give them a drink) and have a good look under it,take the carpet ans spare out & ceck all seem for repair,same under the bonnet,check all wings,door shuts,hatch & make sure all the gaps are the same,ckeck tyres for uneven wear,long test drive& hpi it.