What type of engine oil should be used in summer?
2 Answers
In summer, engine oils with viscosity grades of 20, 30, 40, 50, or 60 at 100 degrees Celsius should be used. Engine oils are primarily categorized into winter and summer grades based on their viscosity ratings, which are commonly referred to as oil grades. The low-temperature fluidity of the oil is the basis for winter oil classification, while the viscosity grade at 100 degrees Celsius is the main reference for summer oils. The primary functions of engine oil are to reduce friction and wear on moving parts, remove sludge (one of the functions of dispersants) and varnish (from detergents) from the engine, neutralize acids produced by fuel and lubricant oxidation (through detergents), improve piston ring sealing, and cool the engine by carrying away heat from moving components.
I've been driving for many years, and when summer comes, oil issues need attention. Under high temperatures, oil tends to thin out, reducing lubrication effectiveness and increasing engine wear risks. I live in the hot East China region, where I previously used 5W-30 oil. When temperatures soared above 35°C, the engine noise increased, and there was slight shaking. Later, I consulted experienced drivers who suggested switching to higher-viscosity oil for summer, such as 10W-40 or SAE 40 and above. Now, I change the oil punctually before summer to ensure sufficient viscosity, so the oil film can withstand high temperatures. I opt for synthetic oil for better durability and regularly check oil levels to avoid them being too low. After switching to higher-viscosity oil, the car runs much smoother. Remember, safety comes first—don’t skimp on this expense, or major repairs will cost more time and effort!
