What are the methods for testing the quality of engine oil?
2 Answers
There are several methods for testing the quality of engine oil: 1. Check the composition of the oil: Engine oils can be categorized into four types based on their composition: full synthetic, semi-synthetic, mineral synthetic, and mineral oil. Full synthetic oil is of higher quality because it has superior cleaning properties, keeps the engine cylinder cleaner during use, allows for smoother cold starts, improves fuel efficiency, has a longer replacement cycle, and provides lubrication effectiveness equivalent to 1.5 times or more that of conventional lubricants. 2. Observe the color of the oil: Imported engine oil is typically golden with a slight blue tint and is crystal clear. Genuine bulk oil is usually light blue with a bright luster and flows evenly. Any oil with uneven color or streaks of different colors during flow is likely counterfeit or deteriorated, and using such oil can severely damage the engine. 3. Smell the oil: Qualified engine oil should have no strong odor, only a slight aromatic scent. If the oil has a pungent smell, especially a strong fuel odor, it is likely recycled oil. 4. Inspect the oil: Perform a drop test by placing a drop of oil from the oil pan onto white paper. Observe the oil drop. If the center of the drop has a large, dark brown spot that is uniform without particles and the surrounding yellow area is very small, it indicates that the oil has deteriorated and should be replaced.
I’ve only been driving for a few years, but I’ve picked up some tips on checking engine oil quality. The simplest method is observing the oil color: fresh oil is usually a clear, light yellow, but if it turns black or cloudy, it may have absorbed impurities and needs changing. Smelling it is also important—if there’s a burnt or odd odor, it indicates oxidation or deterioration. I often dip a chopstick in the oil and drip it onto paper, then wait a few minutes to observe the spread speed; if it spreads quickly, the viscosity is too low, meaning the oil is too thin to protect the engine. I’ve also bought a simple viscosity tester for just a few bucks—testing at home is much easier than waiting for engine trouble. While driving, pay attention to engine noise; increased noise might mean poor oil quality and insufficient lubrication. Regular oil changes are crucial—I check every 5,000 kilometers or six months to avoid costly engine repairs. Poor oil quality not only wastes fuel but can also lead to bearing wear, posing driving risks, so don’t slack off—check it often. These methods are simple and practical, perfect for new drivers’ daily maintenance.
