![]() Straight-grade oils are typically recommended for older vehicles manufactured before multi-viscosity oils were available, prior to 1970. Monograde or straight-grade oil, on the other hand, contains only one viscosity. Choosing an oil which operates at the right temperature range can be beneficial, depending on your engine operating conditions. So, for example, a 5W-40 engine oil and a 15W-40 engine oil will have the same high-temperature flow characteristics (40), but the 5W- will flow better and faster at lower temperatures than the 15W. The second number (30) indicates how the oil flows when the engine is hot. The first number (5W) refers to how the oil flows when the engine is cold. On a bottle of multigrade engine oil, like Shell Rotella ® T6 Multi-Vehicle, for example, you’ll see two numbers: 5W-30. Each motor oil label will vary in design, but most will contain one or two numbers specifying the oil’s viscosity grade.
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