The number before the "W" indicates cold-weather performance—the lower the number, the easier the oil flows when the engine is cold, reducing wear on components during startup. Over time, however, the additives that clean and protect the metal break down, and contaminants such as dust, metal particles, and moisture build up, turning the oil thick and sludgy.
Oil Change Guide: Reducing Engine Wear During Cold Startup
Dark, gritty oil on the dipstick or a burning smell while driving can indicate that the oil is breaking down and losing its thermal stability, requiring prompt attention. The number after the designation reflects viscosity at operating temperature, where a higher number means greater resistance to breakdown under heat and pressure.
Driving on old oil forces the engine to work harder, leading to reduced efficiency, higher emissions, and, in severe cases, catastrophic failure. This not only restricts oil flow but can also lead to deposits that hinder valve operation and reduce fuel economy.
Oil Change Guide: Reducing Engine Wear During Cold Startup
Regular changes prevent the buildup of acids and byproducts that corrode internal components, ensuring the powertrain remains quiet, smooth, and reliable for years. You might also notice a change in engine noise, such as increased ticking or knocking, which suggests the oil is no longer providing adequate cushioning.
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