The quality of a gearbox depends highly on the previous owner(s). This means that you can find out what the general condition of a car is by just checking the gearbox. A poorly functioning gearbox can very well mean that the car in general has been treated badly. An important part which you should check in combination with the gearbox is the clutch.
The engine is the most expensive part of a car and probably the hardest to judge. A quick peek in the engine bay is interesting, but what can actually be seen here? Under the bonnet you can find clues that point to the weak and worn out parts of the engine. A weak part may require maintenance, but can also mean very expensive repairs, in which case it is advisable not to buy the car.
The wheels of a car are important for its looks and driving comfort, however, it are the parts behind the wheels that you should check carefully. Here you find the suspension, consisting out of couplings, shock absorbers and springs. You have to do a thorough visual check of these parts, especially when are buying a car without warranty or at least a fresh MOT.
The tyres of a car are in plain view and therefore easy to check. In order to find out if the tyres are still in good shape, you need to check each tyre individually. Start by measuring the depth of the tread, this will give you good idea of the lifespan. Because a tyre needs a minimum of 1/16th of an inch (or 1.6 mm) tread depth for MOT approval.
