What can you do when you do not have a mechanic available to inspect a used car for you before deciding on whether to buy it or not? DIY is the next best thing with this advice on how to inspect a used car yourself with step-by-step instruction on what to do and what to look out for to avoid being scammed on your next used car purchase. Which includes (but is not limited to) why you should be suspicious when that used car is being sold with a completely full tank of gas.