Flushes, additives and cleaners for your engine can feel a bit like snake oil because they do their job in the heart of the engine, hidden from our eyes, but do they really make a difference? To find out more, we put a number of questions to the experts at LIQUI MOLY to see if they can help explain how their own products work and what evidence they have. We’ve concentrated on the oil for a car’s engine along with the petrol or diesel that’s fed into it, but there are other aspects to look at, which we will be quizzing LIQUI MOLY about in the coming issues.
FLUSH FIRST
Prior to an oil change, an
