Buick LaCrosse 2.4: Should I Use 95 or 92 Octane Gasoline?

[StLane]

Buick LaCrosse 2.4 can use both 92 octane and 95 octane gasoline. Differences between 92 and 95 octane gasoline: 92 octane and 95 octane gasoline have different octane ratings and anti-knock properties. Their ignition temperatures differ. When the engine piston compresses air to perform work, 92 octane fuel ignites at 100°C while 95 octane fuel ignites at 110°C. Engine knocking: When cylinder compression raises air temperature to 105°C, 92 octane gasoline may auto-ignite, causing engine knocking. Using 95 octane fuel prevents premature ignition and thus avoids knocking. The appropriate gasoline grade depends on the compression pressure of air inside the cylinder - higher pressure leads to higher temperatures.

[PeytonRose]

I think the Buick LaCrosse 2.4L engine performs best with 95-octane gasoline instead of 92. This engine has a relatively high compression ratio of around 10:1, and was designed to require higher-octane fuel to prevent knocking issues. High-compression engines are prone to abnormal combustion during sudden acceleration or hill climbing, and using 92-octane fuel with its lower rating increases the risk of knocking. At best, this leads to reduced power and increased fuel consumption; at worst, it can damage pistons or valves, resulting in expensive repairs. The owner's manual typically recommends 95-octane, which is the manufacturer's tested standard. Buick is an American brand with high-quality requirements. Long-term use of 95-octane helps keep the engine clean, reduces carbon buildup, and makes maintenance easier. Although 92-octane is a few cents cheaper per liter, the potential increase in fuel consumption makes it less cost-effective in the long run. I've learned this from my experience in auto repair—sticking with higher-octane fuel ensures smoother driving.

[VonVictoria]

I've been driving my Buick LaCrosse 2.4 for many years and always fill it with 95-octane gasoline, which feels much more reliable than 92-octane. The power response is quicker, especially when using the AC in summer or stuck in traffic—the engine doesn't shake, making the drive comfortable. A friend once suggested I save money by switching to 92-octane, but after trying it, I noticed sluggish acceleration and even had to send the car for repairs. The mechanic said the engine was designed for 95-octane fuel and that lower-grade gasoline can easily cause carbon buildup, affecting its lifespan. Buick is a mid-to-high-end brand, and its fuel requirements match its positioning—there's no need to cut corners. Economically, using 95-octane may cost slightly more, but it means fewer maintenance issues and ensures safety on long trips. I regularly maintain and check the engine oil to keep everything in good condition. In short, I recommend 95-octane for daily driving—it's worry-free and hassle-free.

[SamanthaRose]

I'm considering gasoline based on budget. The Buick LaCrosse 2.4 officially recommends 95-octane for more stable performance. While 92-octane is a few cents cheaper per liter, its lower octane rating may lead to increased fuel consumption. Over time, the costs become similar or even higher. Based on my driving records, using 92-octane increases fuel consumption by about 0.5 liters per 100 km, which isn't cost-effective. If you insist on using 92-octane, check if the engine's compression ratio is compatible, but why take the risk when the manufacturer clearly recommends 95-octane? From an economic standpoint, choosing 95-octane is more worry-free and avoids potential repair costs.