What Are the Differences Between Car Maintenance Engine Oils?
3 Answers
Engine oils used for car maintenance are generally classified into conventional oil, semi-synthetic oil, and full-synthetic oil. The main differences lie in maintenance intervals, price, fluidity, oxidation resistance, and other aspects. Conventional oil, also known as mineral oil, is a lubricant refined from petroleum. The base oil of mineral oil is the residual bottom oil from the crude oil refining process, which remains after the useful light substances (such as aviation fuel, gasoline, etc.) are distilled out, and is then further refined. Relevant information about engine oil is as follows: 1. Introduction: Engine oil, also known as engine lubricant (English name: Engine-oil), has a density of approximately 0.91×10³ (kg/m³). It serves to lubricate and reduce friction, assist in cooling, seal against leaks, prevent rust and corrosion, and provide shock absorption for the engine. It is often referred to as the 'blood' of a car. 2. Composition: Engine oil consists of two main components: base oil and additives. The base oil is the primary component of the lubricant, determining its basic properties, while additives compensate for and improve the shortcomings of the base oil, imparting new characteristics. Additives are an essential part of the lubricant.
I've been driving for over twenty years, and choosing the right engine oil for maintenance is quite a science. Mineral oil is cheap, but it has a shorter lifespan and requires more frequent oil changes. Otherwise, the engine noise increases, and the driving experience feels rougher. Semi-synthetic oil is moderately priced and offers a good balance of performance, making it suitable for most daily drivers. Fully synthetic oil is more expensive, but it provides stronger engine protection, especially with smooth cold starts in winter and resistance to oxidation and thickening in summer heat, along with noticeable fuel savings. Viscosity also matters—for example, 5W-30 is suitable for all seasons, while 5W-40 is better for older cars. Using the wrong viscosity can lead to increased fuel consumption. Always check the owner's manual before each maintenance session, as the manufacturer's recommendations are the most reliable. Poor-quality oil can also cause carbon buildup issues, leading to higher repair costs in the long run. That's why I prefer to spend a bit more on good oil—it saves a lot of hassle.
I often ponder automotive eco-technologies, and the differences in engine oils are quite fascinating. Fully synthetic oil is chemically synthesized, while mineral oil is refined from petroleum. The former is purer, has higher thermal stability, can reduce engine friction by about 5%, lowering fuel consumption and reducing exhaust emissions, making it more environmentally friendly. Recycled oil is also a good option—cheaper and resource-efficient—but its inconsistent quality requires caution, so always choose certified products. Viscosity ratings like 0W-20 suit modern fuel-efficient cars, while 0W-40 is for high-performance engines. When changing oil, consider seasonal variations rather than sticking rigidly to one type. Synthetic oil may be pricier, but its extended lifespan means fewer oil changes per year, saving hassle and indirectly protecting the environment. When choosing, avoid cheap knockoffs to save money—ruining your engine would be the real rip-off.
