Diesel engines offer a wide range of advantages. Despite being workhorses, these engines do not require hands-on maintenance since they have few moving parts so they are at a reduced risk of them breaking down. Moreover, diesel engines are fuel-efficient and provide your vehicle with a great amount of horsepower. However, diesel engines are not immune to wear. And one of the easiest ways of determining if your vehicle is in dire need of diesel services is by scrutinising the colour of the exhaust fumes.