Is Higher or Lower Engine Oil Viscosity Better?

[AaliyahDella]

Engine oil viscosity should primarily be chosen based on what suits the vehicle. The best viscosity is the one that fits the vehicle's requirements. Below is information about engine oil: 1. When selecting engine oil, vehicle owners must understand the temperature environment in which the vehicle operates. They should then purchase oil according to the grade and viscosity requirements specified in the vehicle's manual. Carefully check the grade and viscosity markings on the oil's packaging, ensuring the oil meets the minimum grade and above. For example, in Sichuan, where temperatures vary throughout the year, multi-grade viscosity oil like SAE 15W-40 is typically suitable. In Chongqing, where summers are hotter, it's better to choose oil with a viscosity of 50. 2. The first few thousand kilometers of a new car are called the break-in period. During this time, minor protrusions on parts are worn down, allowing moving parts to fit together more tightly and operate more smoothly. Choosing the right oil during this period is crucial. Generally, oils with viscosity grades of 15W/40 or 40 are recommended for break-in. New cars or engines after major repairs have uneven or overly tight clearances between parts, which need adjustment during the break-in period. Using oil with higher viscosity can make it difficult to form a lubricating film on poorly fitted friction surfaces, leading to dry friction, excessive wear, and even mechanical failures like bearing seizure or crankshaft damage. Lower viscosity oils, due to better fluidity, provide superior cleaning and cooling effects. 3. If the vehicle is primarily used in the city where frequent traffic jams lead to stop-and-go driving, it's considered severe driving conditions, and it's advisable to shorten the oil change interval.

[JulianFitz]

Having driven for nearly two decades, I can confidently share my thoughts on engine oil viscosity—a common concern. Higher viscosity means thicker oil, which offers better engine protection during summer heat or long-distance driving, reducing component wear, though it may slightly increase fuel consumption. Lower viscosity means thinner oil, ensuring smoother cold starts in winter, quicker ignition, and better fuel efficiency, but it might lack sufficient protection under high temperatures, potentially leading to engine overheating or wear. The choice between higher or lower viscosity truly depends on your car’s manual recommendations, as requirements vary by manufacturer. For instance, Japanese cars often recommend lower viscosities like 5W-30 or 0W-20, while older American models may suit higher viscosities like 10W-40. Seasonal factors also matter—I live in the north, so I switch to lower viscosity in winter and slightly higher in summer. Avoid arbitrary changes; mismatched viscosity can cause cylinder scoring or oil burning, damaging the engine long-term. When getting an oil change at a reputable shop, let them help select the right match for peace of mind and safety. Remember, balancing protection and efficiency is key—don’t compromise engine health for minor savings on fuel or costs.

[AllieLynn]

Being a new car owner is quite an experience, and choosing the wrong oil viscosity can be a real headache. Low-viscosity oil is suitable for most city commutes, offering quick acceleration and lower fuel consumption. For my daily stop-and-go traffic during commutes, 5W-30 works great, saving me some fuel costs. However, high-viscosity oil is more reliable for highway driving or heavy loads, providing better engine protection. For instance, during a family road trip with a fully loaded car, switching to 10W-40 made the engine sound smoother. But if it's too thick, cold winter starts might be difficult, requiring a long warm-up. The key is to consider your car's condition and driving habits—don't blindly follow trends. New cars usually follow the manual, favoring low viscosity, while older engines with larger gaps might benefit from thicker oil. During regular maintenance, have a technician check oil pressure to determine if the viscosity is suitable. Overall, there's no absolute best—what fits lasts, and this small maintenance detail can save you big on major repairs.

[EmilianoLynn]

When I was a beginner learning to drive, my instructor taught me not to randomly choose engine oil viscosity—avoid extremes that are too high or too low. Simply put, lower viscosity numbers mean thinner oil, which allows for quicker starts and better fuel efficiency; higher numbers mean thicker oil, offering better protection. Check your car's manual or search online for the model number—for example, my old car specifies 5W-30. In summer, thicker oil helps prevent wear under high temperatures, but if it's too thick, it might clog the pipes. In winter, thinner oil avoids freezing and ensures smooth starts. Also, pay attention to oil brands—don’t switch randomly, as different brands with the same viscosity can perform differently. Consult a professional auto repair shop for free advice—it saves money and ensures safety. Don’t alter viscosity parameters on your own, or you’ll regret it when the engine fails.

[MacCollin]

To save fuel, I prefer low-viscosity engine oils like 0W-20, which make acceleration feel lighter and significantly reduce fuel consumption. However, higher viscosity is necessary in certain situations, such as when carrying heavy loads or driving long distances on highways, where the engine bears greater loads and requires thicker oil films to support components and reduce friction. That said, most modern car manufacturers recommend low-viscosity oils for their efficiency and environmental benefits. Seasonal changes also matter—thinner oils are better for cold northern winters, while slightly thicker oils may be needed in hot summers. Don't forget that engine type plays a role too; turbocharged engines might perform better with slightly higher viscosity. Finding the right balance is crucial—don’t sacrifice engine protection for lower viscosity, and remember to change the oil regularly and check the dipstick.