Motor Oil
Definition:
The lifeblood of the engine, it not only lubricates the engine but also cools the crankshaft bearings and pistons. As an engine runs, combustion blowby into the crankcase contaminates the oil with moisture, soot and unburned fuel. Moisture is the worst culprit because it forms acids and sludge. Additives in the motor oil (nearly a third of a can of oil is additives) fight the contaminants and give the oil special lubricating properties. The oil itself never wears out but the additives do. That's why the oil must be changed periodically to replenish the additives (See Oil Consumption). Dumping in an occasional can isn't enough. The oil filter traps dirt (but not moisture) so it too should be replaced at every oil change. Use the recommended viscosity and type of oil listed in the owner's manual (See Viscosity). The difference between competing brands of motor oil is mostly advertising hype. Any oil of the proper viscosity that conforms to the highest America Petroleum Institute rating should be safe to use. Straight weight or non-detergent oils in late model engines is not recommended.
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