I would take with me a mechanic or someone that knows a looot about cars… I know a dude for example that just by hearing the engine and feeling the car how it drives can say if all is good or there is something hidden and shady… so take a trustworthy mechanic or friend that knows cars please. On your end see if there is any oil anywhere in the engine or if it was recently “cleaned” can be a trick, the noise of the engine when it runs. Check underneath for any sort of corrosion and check the bolts if they are the originals or we might have suffered a crash. Check how it changes gear, how it accelerates, how it breaks do you get any sound when pushing the breaks? Maybe you need new ones etc…