Keeping up with a regular oil change schedule is the single most effective way to extend the life of your engine. 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.
Oil Change Guide: Recognizing Oil Flow Restriction Signs
The number after the designation reflects viscosity at operating temperature, where a higher number means greater resistance to breakdown under heat and pressure. Modern detergents in fresh oil keep sludge from forming, but once these detergents are spent, the debris settles and sticks to the walls of the engine.
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. 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: Recognizing Oil Flow Restriction Signs
Understanding the fundamentals of an oil change allows you to maintain consistent performance and protect your investment mile after mile. 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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