Should Engine Oil Be Changed When It Turns Black?

[MakaylaDella]

Engine oil does not necessarily need to be changed just because it turns black; whether it should be replaced depends on the oil's viscosity. Below are two reasons why engine oil may turn black: 1. The old oil in the engine was not completely drained before adding new oil, causing the new oil to mix with the residual old oil and turn black. 2. The use of counterfeit or substandard engine oil with poor lubrication and cleaning capabilities leads to the accumulation of many impurities, causing the oil to turn black quickly. Here are several methods for selecting engine oil: 1. When the engine is in good condition and the seasonal temperature is relatively low, choose engine oil with lower viscosity to ensure smoother oil flow. During high summer temperatures, opt for higher viscosity oil, which helps form a protective oil film, safeguarding components and reducing engine wear. 2. Whenever possible, choose multi-grade oil, as its performance is reliable in both high and low temperatures. 3. Select the appropriate oil grade based on your vehicle's engine requirements, neither too high nor too low for your specific situation.