Mechanics have warned that motorists who predominantly drive at low speeds could be unknowingly damaging their engines. A build-up of carbon deposits, colloquially known as 'black death', can occur when vehicles are not regularly taken on faster roads, leading to potentially costly repairs.
The condition arises from unburnt fuel and inadequate engine circulation, resulting in a dense, dark residue that can accumulate inside valves, pistons and the exhaust system. According to motor repair finance specialists Bumper, this can reduce fuel efficiency and, in severe cases, cause the engine to seize completely.
A spokesperson for Bumper explained that short journeys at low speeds prevent the engine from reaching temperatures high enough to burn off carbon deposits. However, they noted that a simple remedy exists: taking the car onto a motorway and driving at a higher, yet legal, speed for 45 minutes to an hour. This heats the engine fully and allows fuel to act as a natural cleaning agent, removing deposits from vital components.
Drivers are also advised to check beneath the oil cap for a milky substance or white foam, which can indicate water condensation in the engine oil due to inadequate warming. The Bumper spokesperson stated that while this is not necessarily a serious fault, it can lead to long-term problems if ignored. A sustained motorway drive can evaporate the moisture and prevent build-up.
With repair costs potentially running into thousands of pounds, Bumper is urging motorists to maintain regular servicing schedules and avoid delaying preventative care. The company emphasised that the best approach is prevention, adding that giving a car a proper run every now and then is often enough to stave off serious engine trouble.
