What are the functions of engine cleaners and protectants?

[DawsonLynn]

Cleaners and protectants serve different purposes: one removes dirt and contaminants for expulsion, while the other forms a protective film. However, both functions can be achieved by engine oil alone. One of the primary roles of engine oil is to clean the internal components of the engine, thereby reducing wear on various parts. Protecting the Engine: Engine cleaners primarily target sludge removal in the crankcase, whereas engine protectants enhance the oil's anti-wear properties and inhibit sludge formation. Consequently, manufacturers often bundle these two products for sale. The process involves adding the cleaner to old oil before an oil change for cleaning, draining the old oil, refilling with fresh oil, and finally adding the protectant to establish engine protection. Base Oils: Base oils are categorized into three types: mineral oil, semi-synthetic oil, and full synthetic oil.