Can Blackened Engine Oil Still Be Used?
2 Answers
If engine oil turns black shortly after use, it is a normal phenomenon. However, if it has been used for a long time, the oil should be replaced. Failing to replace it in time can affect the engine. The quality of oil is not determined by its color. The functions of engine oil include cleaning, lubrication, cooling, and rust prevention. The blackening of engine oil is caused by the combined effects of carbon deposits, gum, impurities, and other substances resulting from gasoline combustion. Engine oil, also known as engine lubricant, is hailed as the 'blood' of a car, providing lubrication, cleaning, cooling, sealing, and wear reduction for the engine. The quality of automotive engine oil is indicated by the letter 'S', commonly including SA, SB, SC, SD, SE, SF, SG, SH, and SJ. The alphabetical order represents the development of oil quality and the advancement of additives.
I've been driving for over a decade, and seeing engine oil turn black is a common occurrence—it's really not a big deal. The oil turns black mainly because it's responsible for cleaning carbon deposits and dirt from the engine, much like how a vacuum cleaner gets dirty, which is perfectly normal. However, black oil doesn't mean it's harmless; the key is to consider your mileage and oil change interval. Generally, you should change the oil every 5,000 to 10,000 kilometers or every six months. If the oil turns black and you notice the engine noise increases or acceleration feels sluggish, don't delay—change the oil immediately to avoid excessive wear and potential engine damage. By the way, when changing oil, opt for reputable, high-quality brands to better protect your engine, saving money and ensuring peace of mind in the long run. Regular maintenance is fundamental to car care—don't skip it. During each oil change, take the opportunity to inspect other components to prevent safety hazards.
