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. Understanding the fundamentals of an oil change allows you to maintain consistent performance and protect your investment mile after mile.
How Sludge Deposits Form and Damage Your Engine
Always refer to your owner’s manual for the manufacturer’s recommended grade, as using the wrong viscosity can void warranties and damage the engine over time. 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.
The number after the designation reflects viscosity at operating temperature, where a higher number means greater resistance to breakdown under heat and pressure. 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.
How Sludge Deposits Form and Damage Your Engine
A dashboard oil pressure light or a dipstick reading that shows a low level are clear warning signs that should never be ignored. 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.
More About Oil change guide
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