What is the function of automotive lubricating oil?

[OManuel]

Automotive lubricating oil can provide lubrication, reducing friction between rubber seals and window glass, effectively eliminating mechanical noise; it can also effectively clean window stains, prevent aging and corrosion of rubber seals, prevent water leakage from seals, and has functions such as moisture-proof sealing. The following are specific introductions to lubricating oil: 1. Applicable parts: Lubricating oil is suitable for parts such as windows, sunroofs, door hinges, engine hood hinges, electric rearview mirrors, and wipers, providing excellent lubrication effects for conditions like rust, jamming, and abnormal noises. 2. Classification: It is divided into engine oil, gear oil, grease, refrigeration oil, and vacuum pump oil.

[ElizaMarie]

Engine oil is like the lifeblood of an engine, and I must say it's particularly crucial. Right after an oil change, the engine runs noticeably smoother. During daily driving, it reduces friction between internal components, acting like a slippery protective film between parts. The oil also cleans carbon deposits and impurities, preventing sludge buildup that could clog oil passages. A friend once had blue smoke from his exhaust, which turned out to be caused by worn piston rings burning oil - a stark reminder for me to monitor oil consumption regularly. Whether in summer traffic jams with high temperatures or during cold winter starts, only the right viscosity can maintain a stable oil film. Most importantly, engine oil carries heat away to the cooling system, preventing cylinder scoring risks. I strictly change to full synthetic oil every 8,000 kilometers - this investment is far more cost-effective than engine repairs.

[LeAustin]

Having repaired cars for 15 years, I often remind customers not to skimp on engine oil costs. High-quality oil contains anti-wear additives that form a protective layer on crankshaft bearing surfaces. Recently handled a connecting rod bearing failure case where metal debris contaminated the oil passages due to prolonged oil neglect. Especially for turbocharged vehicles, oil deteriorates faster under high-temperature conditions - pay extra attention to selecting API SP-certified oils. Last time when inspecting a customer's older car, found valve guide lubrication issues causing abnormal noise, which was resolved by switching to high-flowability oil. Oil filters must be replaced simultaneously, otherwise the fresh oil gets contaminated and becomes useless within 3,000 km. Remember an old BMW N52 engine that used wrong oil and kept having VANOS system failures.

[VanPaul]

Choosing engine oil is like selecting skincare products—it depends on the vehicle's condition and environment. In northern winters, low pour-point oils are essential to ensure pumpability even at -30°C. As a hybrid driver, I specifically opt for energy-efficient oils with low-ash formulations to protect the GPF, and a 0W-20 viscosity grade does save fuel. Before my last long trip, I checked the dipstick and found the oil level at the lower limit, so I promptly topped up with the same type. Monitoring oil condition is crucial—if it appears black with metal particles, it's time for a change. OEM certifications like Mercedes-Benz 229.5 ensure better compatibility with seals. For vehicles with direct fuel injection, shortening the maintenance interval is advisable, especially for frequent short-distance driving.

[Michael]

My novice driver relatives always ask about oil change intervals, but it really depends on driving conditions. For mainly commuting in congested areas, full synthetic oil should be changed every 8,000 km. For occasional highway cruising, it can extend to 12,000 km, but at least once annually. Last inspection revealed sludge in a German car - the result of only two oil changes in four years. Though dealership OEM oil is expensive, its specifications match most accurately. I prefer checking the dipstick when cold, with oil level at 70% between min/max marks being ideal. After aggressive driving, always inspect oil condition as high temperatures accelerate oxidation. Remember to tighten the cap on leftover oil bottles to prevent moisture contamination affecting future use.