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1. Engine oil

Engine oil is a lubricating fluid used in your vehicle’s engine to reduce friction, cool moving parts, clean, and protect the engine from wear and corrosion. It's absolutely essential for smooth and efficient engine operation.

• Lubricates engine parts - Reduces friction between moving parts (like pistons and crankshaft).
• Cools the engine - Carries heat away from hot engine components.
• Cleans - Removes dirt, metal particles, and sludge.
• Protects - Prevents rust and corrosion.
• Seals - Helps seal tiny gaps between the piston rings and cylinder walls.

Using a funnel to refill the engine oil in a car as part of an oil change. © Wikimedia.org/Dvortygirl, CC BY-SA