What type of engine oil should be used for a car with 100,000 kilometers?
2 Answers
For a car with 100,000 kilometers, use 5W-40 engine oil. Engine Oil: Engine oil, also known as engine lubricant (English name: Engine oil), has a density of approximately 0.91×10³ (kg/m³). It serves multiple functions for the engine, including lubrication and wear reduction, auxiliary cooling, sealing and leak prevention, rust and corrosion protection, and shock absorption. It is often referred to as the "blood" of a car. Engine oil consists of two main components: base oil and additives. The base oil is the primary constituent of the lubricant, determining its fundamental properties, while additives compensate for and enhance the base oil's performance, providing additional characteristics. Additives are a crucial part of the lubricant. Key Features of Engine Oil: The engine is the heart of a car, containing numerous metal surfaces that move against each other under high speed, harsh conditions, and temperatures ranging from 400°C to 600°C. Advanced technology can convert natural gas into crystal-clear, fully synthetic base oil, which is then combined with proprietary cleaning technology to create lubricants with superior cleaning and protective properties. Only high-quality lubricants can reduce engine component wear and extend service life under such extreme conditions. Engine oils on the market can be broadly categorized into mineral oil and synthetic oil based on their base oil (vegetable oils are not considered due to their scarcity). Synthetic oils are further divided into full synthetic and semi-synthetic. Lubricant base oils mainly fall into two categories: mineral base oil and synthetic base oil. Mineral base oils are widely used and account for the majority of the market (over 95%), but certain applications require products formulated with synthetic base oils.
My old car has already run nearly 150,000 kilometers, and over the years I've learned some tricks about oil changes. For cars with over 100,000 km, you should focus on sludge cleaning and anti-wear properties - I recommend using 5W-30 or 5W-40 full synthetic oil, and never arbitrarily switch to lower viscosity grades. Last year I tried saving money with the wrong oil, and the engine started making gurgling noises like it had phlegm stuck in it. When I opened the engine cover, it was full of sludge. Now I only buy high-mileage certified oils - not because of brand superstition, but mainly because these oils contain extra additives to prevent seal aging. You need to check the dipstick every 5,000 km - old cars especially tend to burn oil. Last month I had to top up half a liter just to make it to the next service interval. Remember to ask your mechanic to check the oil pump pressure - severely worn engines often show pressure drops.
