How often should engine oil be changed for frequent highway driving?
1 Answers
If you frequently drive on highways, it is recommended to change the engine oil every 6,000 to 10,000 kilometers, as regular oil changes help maintain optimal engine performance. Here are some methods to determine when the oil needs to be changed: Smell test: Pull out the dipstick and bring it close to your nose. If you detect a strong sour smell, it indicates the oil has deteriorated and should be replaced. Rub test: Rub the old oil between your thumb and index finger repeatedly. If it feels smooth with minimal abrasion and no friction, it is still good. If you feel impurities, poor viscosity, or even a gritty sensation, it should be replaced. Color test: Place a drop of oil on a clean white filter paper. After the oil seeps through, good-quality oil will leave no residue, feel dry and smooth, and show a clear yellow diffusion ring. If the oil appears dark brown with impurities, it should be replaced. Light test: Hold the dipstick at a 45-degree angle under a light source and observe the oil drop. If the drop is clear with no visible metal particles, the oil is still good. If there are many metal particles, it should be replaced.