Will Using 40-Grade Engine Oil Damage the X-Trail?

[ValentinaLynn]

Using 40-grade engine oil in the X-Trail will not damage the car, but it may slightly increase fuel consumption. Functions of Engine Oil: To reduce friction and high-temperature effects, a sufficiently thick oil film separates the surfaces of relatively sliding parts, thereby minimizing wear. It also serves as a sealant, forming a sealing ring between the piston rings and pistons to reduce gas leakage and prevent external contaminants from entering. Additionally, it provides anti-rust protection by adsorbing onto part surfaces to prevent contact with water, air, acidic substances, and harmful gases. Uses of Engine Oil: As a lubricant, it reduces friction and damage between moving parts. For example, it minimizes friction between the cylinder liner and piston rings (or camshaft).

[VanHailey]

I've been driving a Qashqai for several years, and seeing your question about using 40-weight oil, I have to share my thoughts. High-viscosity oils like 5W-40, if used in a Qashqai, are usually not recommended as the manual typically suggests thinner oils such as 0W-20 for better cold-start efficiency. Higher viscosity increases internal engine friction, slows oil flow during startup, leading to inadequate component protection, potentially higher fuel consumption, and over time, increased engine wear which could shorten its lifespan. As an owner, I once experienced issues from using the wrong oil—the engine sounded odd—but after checking the manual and switching back to the correct grade, everything was fine. I advise against cutting corners with cheaper, incorrect oils. Regular oil changes with the right viscosity keep your car running longer and more reliably. Also, frequently check the engine dipstick and keep it clean; these small details can save you money and keep your car healthy.

[DiMary]

Hey, talking about using 40-weight oil in the X-Trail, it's pretty common but not a good thing. Higher viscosity increases friction, the oil isn't slippery enough at startup, leading to insufficient cold-start engine protection, and fuel consumption might rise. Long-term use can accelerate wear and tear, potentially even damaging the engine. My mechanic friends always emphasize: check the car manual for the recommended grade—like the X-Trail usually uses 0W-20 or 5W-30—don't guess. From personal experience, once you use high-viscosity oil, the car feels heavier to drive, and the power response slows down. My advice is to check the manual ASAP, don't just use it temporarily, switch to the correct oil to reduce risks. For routine maintenance, don't forget to check the oil every 5,000 kilometers and use good-quality oil.

[SanAdaline]

Using 40-weight oil in the X-Trail may cause problems. The high viscosity increases internal engine resistance, resulting in poor cold-start protection; it also increases friction during operation, leading to greater wear and higher fuel consumption. Long-term use may damage the car and reduce engine lifespan. The owner's manual recommends low-viscosity oil such as 0W-20, so avoid using the wrong grade. It's advised to follow the manual's oil specifications and change it regularly to maintain freshness. Don't risk major damage for minor savings—using the correct oil extends vehicle longevity, saving money and ensuring safety.