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For most engines, a quality 10W-40 engine oil is typically used after about 75,000 miles of driving. Below that milage, many manufacturers specify 10W-30 oil. The 10W means that at low temperatures, the oil has a viscosity rating of 10. As the oil warms up in the engine, it changes viscosity to the higher number. This is because cold, heavy weight oil will make the engine very difficult to turn over. In extremely cold climates, 5W-30 or 40 multi-weight oil is usually available.

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