When running the engine of your car, soot particle will enter the oil. This is what turns the oil black. Over time, oil also deteriorates. Chemicals to “Flush the engine” are available, promising that the substances will remove any harmful residue.
However, as these chemicals are oftentimes highly aggressive, they can be harmful to the gaskets and seals. Such harsh chemicals in some flush fluids can even strip away protective oil films and consequently increase friction and wear on engine components. An oil film is required, which is why the lubricant is there is the first place. In extreme cases, large chunks of loosened debris could clog oil passages, restricting oil flow and causing damage.
Advertised as a method that can be carried out by anyone, these types of engine flushes may not find approval by German Motors as there is a risk of severely damaging the most expensive component of the vehicle, the engine.
Instead, a flushing of the engine using engine oil, added to the oil change, could enhance the effect of the oil change. After the old oil has been drained from the oil sump, the required amount of engine oil is filled into the oil system. Then the engine will run for a short while. In doing so, more of the old oil can be extracted, contaminants that could not be bound by the old oil swiped up. Then the oil will be drained again, and a second filling will take place.
Although an engine flush using engine oil can remove built-up sludge and debris, the draining of the flushing oil and replacing it with fresh, regular engine oil is not to be recommended with every oil change. It is best to have a word with the technicians at German Motors to find out if you should be adding this process.
