Also, if he doesn't already know how - make sure he knows how to change a tyre, check the oil/coolant and fit new windscreen wipers. My cousins (the ones who drove with me most often) even though they knew I'd grown up on a farm so had known how to do most of this stuff since the age of about 12 still made me take a wheel off and put it back on just to prove that I could. Came in really handy when I busted a tyre on a country road miles from anywhere