The third figure relates to the engine. The 120 series has a justified reputation for strength and reliability. Parts availability is good and there are a number of specialised suppliers who offer a wide range of alternative parts and secondhand spares. The cars are not immune to rust but cope with it far better than most of their contemporaries. The most common areas are the front wings which are easily replaced, rear wheel arches and on saloons the spare wheel well.
Doors can suffer from rot in the lower regions and spare doors are becoming scarce.
Obviously if one finds a badly rusted car, especially in the floor pan, one should seriously consider the cost of repair. Bonnets and boot lids are generally rot free. Interiors, replacement material is scarce but the average car does not usually suffer from poor interiors as the original is very durable. Mechanical problems are usually down to lack of servicing. Engines will last 150,000 miles before major work is required, especially if the oil has been changed regularly along with the oil filter.