What is C15W-30 engine oil?

[OAubrey]

C15W-30 is a 15W-30 engine oil. C15W-30 represents: 15 indicates the minimum applicable temperature of the oil is -30 degrees Celsius, W stands for Winter, meaning the oil is suitable for year-round use. 30 refers to the high-temperature viscosity at 100 degrees Celsius. The higher this number, the thicker the oil. Below is more information about engine oil: 1. Full synthetic oil: Full synthetic oil offers better high and low-temperature performance, has a longer oil change interval, and is suitable for more severe driving conditions, making it ideal for luxury and high-performance vehicles. It should be replaced approximately every 10,000-12,000 kilometers. 2. Semi-synthetic oil: Semi-synthetic oil typically requires replacement every 8,000-10,000 kilometers, offering a balance between price and performance. 3. Mineral oil: This type of oil generally needs to be replaced every 5,000 kilometers.

[VanCharlie]

I've researched this 15W-30 motor oil. It's a multi-grade viscosity oil suitable for most regular vehicles. Simply put, 15W indicates winter low-temperature fluidity - the lower the number, the easier cold starts are; 30 represents high-temperature viscosity, protecting the engine from wear in hot conditions. This oil performs well in areas with significant temperature variations, handling all seasons from spring to winter, eliminating the hassle of seasonal oil changes. I've used it in several cars and noticed smoother engine operation, reduced noise, and extended lifespan. When selecting, check API specifications: SL or SN for gasoline engines, CJ-4 series for diesel engines. Recommend changing every 5,000 km or 6 months. Never mix different oils as it may damage the engine.

[McKylie]

In my experience, 15W-30 oil works quite well for regular vehicles, especially mid-range models. It maintains a good viscosity balance, provides quick cold starts, and keeps the oil film stable under high temperatures. I've used it in my own car for 100,000 kilometers without major issues. Remember to choose detergent-type additives to help reduce carbon buildup. Regularly check the dipstick and top up when the oil level is low. Select oil according to weather conditions—avoid thicker grades during snowy winters in northern regions. For older engines, this oil can be prioritized to reduce friction losses.

[HeidiLee]

15W-30 engine oil is a fundamental maintenance essential. It covers common driving temperature ranges, with 15W low-temperature fluidity ensuring smooth cold starts, while the high-temperature 30 rating provides adequate lubrication. I've noticed many drivers choose it for its cost-effectiveness and ability to extend engine service intervals. Remember to change oil regularly and check oil quality—don't compromise by purchasing expired products. Combine with manual-recommended API classifications, such as SM or SP grades for gasoline engines, to protect emission systems.