What kind of oil should a naturally aspirated engine use?

[LaVictoria]

For ordinary household cars with naturally aspirated engines, engine oils such as 5w20, 0w20, 5w30, and 0w30 are generally suitable. Naturally aspirated engines do not have very high requirements for engine oil, whereas turbocharged engines have relatively higher requirements and need to use higher viscosity engine oils. Additional information: 1. Engine oil is something every car owner will come into contact with during vehicle use. Engine oil is referred to as the lifeblood of the engine. Without engine oil, the engine cannot operate normally. Inside the engine, oil not only lubricates but also cleans, seals, buffers, prevents rust, and dissipates heat. 2. When the engine is running, the oil forms a thin film on the surface of various components inside the engine, preventing direct contact and friction between them. If components directly contact and cause friction, it will accelerate engine wear and may also lead to the instant generation of large amounts of heat within the engine, which can be fatal to the engine. Over time, all performance aspects of engine oil will degrade, so it is necessary to change the engine oil regularly.

[AlexaRose]

I've driven naturally aspirated cars for many years, and based on my experience, viscosity grade matters. The mainstream choices are 5W-30 or 5W-40 synthetic oils. Fully synthetic oils offer better wear resistance and smoother starts, especially protecting the engine in cold weather or during long-distance driving. I always opt for major brands like Mobil or Shell, avoiding cheap mineral oils to prevent excessive carbon buildup inside. Change the oil every 5,000 km and check the oil level to ensure it's not too low. Key points: temperature affects oil selection—in southern summers, a slightly thicker viscosity is acceptable, but don't exceed 0W-20 to avoid higher fuel consumption; new and old cars have slightly different requirements, as noted in the manual—follow it to save money and stay safe.

[ReedDella]

As someone who commutes by car every day, I prioritize practical cost savings. Naturally aspirated engines aren't too picky about oil - semi-synthetic works fine, being both affordable and durable. I recommend 5W-30 viscosity as it covers most weather conditions. The key is frequent oil changes, around every 6,000 km, to prevent engine aging and malfunctions. Money-saving tip: Go to authorized oil change shops instead of DIY attempts, and buy oil test strips to check contamination levels. Related point: Check API certification for oil grade - SN or SP level is sufficient; overly thick oil like 10W-40 increases fuel consumption - I saved half a liter per 100km after switching to standard viscosity. Economically sensible and extends vehicle lifespan.

[FelixLee]

For naturally aspirated engines, SAE 5W-30 is the most common oil choice, with synthetic types being better at handling high-temperature wear. Don't blindly believe in high viscosity; using the wrong oil can damage the engine and increase fuel consumption. Stick to regular oil changes and adjust based on driving conditions. For urban congestion, shorter oil change intervals are recommended. The API SN quality certification provides sufficient protection.