Shop for New Auto Parts at 1AAuto.com http://1aau.to/c/85/q/engine-oil-pan Engine knock is a sure sign that something isn't right. An engine should sound like a well oiled machine! In this video, Len takes the first step of diagnosing odd engine noises: an oil change. You'll learn why skipping oil and filter changes is a surefire way to destroy your engine!

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