Can Good Engine Oil Improve Car Performance?

[OHeidi]

Using engine oil with better lubrication effects can indeed enhance the engine's performance. Here are some relevant details about engine oil: 1. Reduced Friction: This is because engine oil with good lubrication properties decreases the engine's internal friction, thereby reducing the engine's own resistance, which indirectly increases the engine's power. It can also lower engine noise, as part of the noise comes from vibrations caused by friction; reduced friction naturally leads to less noise. 2. Cleaning Effect: The additives in engine oil have a cleaning function, so after adding new oil and running the engine for a while, it dilutes and washes away the dirty oil from various friction components. The friction surfaces are then covered with new, clean oil, significantly improving lubrication and reducing movement friction resistance.

[OEden]

Having driven heavy trucks for over twenty years, I can definitively say that good engine oil doesn't directly increase horsepower. It's like high-quality blood in your veins—its core function is to protect metal components by reducing friction. However, right after switching to full synthetic oil, you might notice the throttle feels more responsive. That's because old, oxidized oil becomes viscous, and the new oil reduces piston movement resistance, allowing the engine to release power that was previously being consumed. But this 'power boost' at best restores the car's original performance—don't expect a 1.5L engine to magically become a 2.0L just by changing the oil. If you truly want more power, upgrading the intake and exhaust systems is far more effective. Remember, the biggest benefit of premium oil is extending engine life, especially crucial for turbocharged vehicles.

[LaLiam]

An engine R&D expert shares a little-known fact: Using 0W-20 low-viscosity full synthetic oil can actually save 3% fuel consumption in real-world tests. The principle is similar to replacing syrup with water—better low-temperature fluidity means less resistance during cold starts. While a dynamometer might not show increased power, you'll notice the tachometer climbs more willingly. My old Fit became noticeably more responsive at 2000 rpm after the oil change. However, be warned: low-viscosity oil may cause oil burning in older vehicles, and German cars particularly require manufacturer-approved oils. Rather than obsessing over power gains, focus on oil cleanliness—keeping piston rings free of carbon deposits is what truly maintains engine performance.

[BentleyFitz]

Southern friends might feel this more deeply: using the wrong engine oil in summer directly weakens the AC performance! Last year, I cheaped out and bought high-viscosity mineral oil. When climbing hills with the AC on, the RPM soared but the speed wouldn't increase. Later, the mechanic explained that overheated oil becomes thinner, leading to insufficient oil pressure, and the ECU automatically limits power to protect the engine. After switching to 5W-30 full synthetic, I finally didn't need to floor the gas pedal to overtake with the AC on. This isn't to say that engine oil enhances power, but rather that it avoids the drag of inferior oil. Now I always look for ACEA C3 certification when buying oil, as maintaining oil film strength ensures stable power output.