Heat is a primary enemy, as it accelerates the oxidation process, causing the oil to thicken and form sludge. You can also rub a small amount between your fingers; if it feels excessively gritty or sandy, it likely contains contaminants that will act as an abrasive inside your engine, signaling that it should be discarded.
Recognizing the Signs of Degraded Motor Oil in Your Engine
Conventional motor oils, which are refined from crude oil, typically have a shelf life of up to five years when stored properly in their original, sealed containers. Understanding the factors that cause this degradation and how to identify it is crucial for protecting your engine from unnecessary wear and potential damage.
For maximum longevity, store oil in a cool, dark, and dry place, such as a climate-controlled garage, to preserve its chemical stability. As additives deplete and the base oil oxidizes, the oil can become too thin to maintain a proper film thickness, or conversely, too thick to flow efficiently.
Recognizing the Signs of Degraded Motor Oil in Your Engine
Conversely, extreme cold can cause the waxes in the oil to crystallize, altering its flow characteristics. The Role of Additives Degradation Modern motor oil is a complex chemical cocktail, far more than just refined base stock.
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