Engine Oil Information Why Motor Oil is Important Motor oil is a lubricant that keeps the hundreds of moving parts in your car's engine from rubbing up against each other and causing wear. • It reduces friction, • allows your car to start easily, • keeps the engine clean, • blocks any little gaps between the piston ring and the cylinder walls, • prevents rust and corrosion. • It also keeps any foreign particles away from engine parts. Oil Viscosity Viscosity is the ability of a liquid to be poured. Multi-grade Motor Oil Multi-grade oil has two numbers and a letter, for example 10W - 30. The first number refers to the low-temperature viscosity, or the viscosity of the oil when the engine is cold. The second number refers to the viscosity of the oil when the engine is at operating temperature. A higher number viscosity rating will not flow as easily as a lower number, so a lower number is better for colder temperatures. API Service Ratings • SM - For all automotive engines presently in use. SM oils are designed to provide improved oxidation resistance, improved deposit protection, better wear protection, and better low-temperature performance. • SL - For 2004 and older automotive engines. • SJ - For 2001 and older automotive engines. Choosing the Right Motor Oil • Mineral oils are based on refined crude oil that comes from dear old Mother Earth. • Synthetic oils are designed to reduce wear and tear on gears, reduce oil oxidation and sludge formation, and allow for extended drain intervals. • Semi-synthetic, sometimes called premium, which is a blend of the two. When to change engine oil • http://www.ehow.com/video_2326740_when -change-motor-oil.html Eventually motor oil breaks down in the engine. Contaminants accumulate cause oil to lose viscosity. Additives in the oil are used up in normal operation of the vehicle, after which corrosion and oxidation occur. Some experts recommend changing the engine oil every 5,000 km (3,000 mi) or every 3 months. Follow your owner’s manual.
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