What is Motor Oil? | Pennzoil
https://www.pennzoil.com/en_us/education/know-your-oil/what-is-motor-oil.html
WEBWhat is Motor Oil? Historically, motor oil was just a mixture of base oil and additives used to lubricate engine parts, reduce friction, clean, cool, and protect the engine. However, modern synthetic motor oils are a complex mixture of base oils and additive components designed to perform a variety of tasks: Separating and lubricating moving parts.
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