Engine oil plays a crucial role in protecting and operating a vehicle's engine. A quality oil not only lubricates the moving parts, but also helps keep the engine clean and prevents overheating. But how can you tell if an engine oil is good? Let's look at the main signs to consider when evaluating the quality of engine oil.
1. Oil color
One of the easiest ways to check the condition of your engine oil is by its color. When new, oil has an amber or yellowish hue. If the oil appears very dark or black, it indicates that it is contaminated with impurities and should be changed. Clean oil provides efficient lubrication, while oil that is too dark may no longer perform its protective function properly.
2. Consistency and viscosity
In addition to color, the consistency of the oil is also an indicator of quality. The oil should have a fluid but viscous consistency. If it appears too thick or has lumps, it is possible that it has deteriorated or has been contaminated by water or other agents. On the other hand, an oil that is too thin may not provide adequate protection, especially during cold starts.
3. Viscosity and SAE classification
Engine oil viscosity is indicated by an SAE rating (for example, 5W-30 or 10W-40). This indicates the oil's ability to flow at different temperatures. An oil with a lower number before the "W" (such as 5W) is more fluid at low temperatures and suitable for cold climates. On the other hand, an oil with a higher number after the "W" (such as 40 or 50) is thicker when hot, therefore better suited for hot climates or engines subjected to heavy stress.
4. Odor and signs of contamination
Another thing to consider is the smell of the oil. If you notice a burnt or strange smell, it could be a sign that the oil has lost its lubricating properties due to overheating or excessive wear. Also, the presence of foam or bubbles can indicate that the oil has become contaminated with water, which poses a risk to the engine.
5. Oil change frequency
The time since the last oil change also affects its quality. Mineral oils, for example, tend to last less than synthetic or semi-synthetic oils. In general, high-quality synthetic oils can maintain their properties for up to 30,000 km, while mineral oils require more frequent changes, approximately every 5,000-10,000 km.
6. Manufacturer's specifications
Finally, it is important to choose an oil that meets the vehicle manufacturer's specifications. Every engine has different needs and using an oil that is not compliant can compromise its life and performance. Always check your vehicle manual to make sure you are using the correct oil classification.
Conclusion
To assess the quality of your engine oil, it is essential to regularly check the color, consistency, and level of the oil, following the manufacturer's recommendations. Good oil ensures a more efficient and long-lasting engine, reducing the risk of costly damage over time.
