The engine oil protects as much as it lubricates your cars engine. It lessens friction inside the engine that occurs at high speeds and during high temperatures (especially when you are crawling in heavy traffic).
But as oil does its job, the additives boil out. Contaminants collect and sludge forms. Before long, the oil is filled with so much foreign material that it begins to grind away at the very parts it was meant to protect. Change your oil according to your owner’s manual instructions and where possible use Shell Helix with PurePlus technology and you should never have to deal with words like sludge and contaminants.
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