Engine
As part of the HPI you must look for the engine number, however additionally take a look over the engine, you don't need to be an expert, just look out for oil or water on the engine, see the engine running and let it run for a good few minutes, after the test drive look at the engine again to see if any further oil or water has appeared.
Be sure to check the oil cap for creamy coloured residue. This could be a sign of a gasket leaking water into the oil. Also any other residue such as metal fragments is also a sign of strong engine wear.
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