Manufacturers determine this rating based on rigorous testing to ensure the oil maintains a sufficient film strength to prevent metal-to-metal contact, resist shearing forces, and manage heat dissipation even under severe conditions. If the film is too thin, metal components will grind against each other, causing wear.
Oil Weight Explained Hot Climate Effects
This number is measured by testing the oil's flow at extremely cold conditions, typically at 0°F (-18°C). You should always consult your owner’s manual first, as it will list the exact viscosity grades approved for your engine.
Climate Considerations for Oil Selection While your manual provides the baseline recommendation, your local climate can influence your choice. In regions with harsh, sub-zero winters, drivers often benefit from the maximum cold-cranking protection offered by a 0W or 5W formula.
Oil Weight Explained Hot Climate Effects
A 30-weight oil is thinner than a 40-weight oil at operating temperature. Using a weight that is too heavy can lead to sluggish acceleration and reduced fuel economy because the engine has to work harder to pump the thicker fluid.
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