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Is Changing Motor Oil Important?
 
Ask Your Stickiest Question. . . Or ask us something you’ve always wanted to know about using our products. We’ll sort through all the submissions and present the best questions to our automotive experts. We'll share the questions and their answers here.
Question:
Is Changing Motor Oil Important?
Why is it important to change your oil?
-- David Tillman, Arlington Heights, IL
Answer:
Motor oil probably handles more tasks within an engine than any other component, fluid or material. Some of the key motor oil tasks are to protect the engine by lubricating its moving parts, cool critical engine parts by transferring heat away, pump easily to critical engine parts at low temperatures, keep internal components clean and free from varnish and harmful deposits. No matter how good the oil, eventually they can no longer perform the previously described tasks effectively. That´s because with time and mileage, the oil´s additives get used up, causing the engine oil to degrade. At this point the oil must be changed before sludge and deposits build up. When the oil is drained, the contaminants are removed with it.
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