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There are at least five main functions of engine oil: Cool--absorbs heat as it is circulated, cooling the engine. Lubricate--creates a viscous barrier between moving parts that reduces friction, which means less heat and longer life for those parts. Clean--small particles of dirt or other contaminants are suspended in oil and carried away to be filtered out. Seal--helps to seal the space between the pistons and the cylinder walls so that compression is more effective and power is not lost during combustion. Protect--coats parts to provide a layer of protection against corrosion/rust.

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