Other areas to look out for include the transmission and suspension, both of which can suffer leaks over time. If the car is having trouble shifting into reverse, the steering wheel is too loose or the car is making any strange noises, it could be due to the transmission or suspension.
The best way to check for any of these problems is to inspect and drive the car yourself. A vehicle history report can also indicate potential problems. In the end, it is your responsibility as the used car buyer to make sure your potential vehicle is up to your standards.