Should Suzuki UU125 use 92 or 95 gasoline?

[JustinRose]

According to the official introduction of Jinan Suzuki motorcycles, the Suzuki UU125 can use 92-octane gasoline. The engine of the Suzuki UU125 is a 125ml single-cylinder four-stroke engine with a compression ratio of 10.3:1, so 92-octane gasoline is sufficient. Of course, the Suzuki UU125 can also use 95-octane gasoline. Although 95-octane gasoline is slightly more expensive, it can help the engine perform better and extend its service life.

[VanValentina]

I usually ride a Suzuki UU125, and I specifically checked the manual. The official recommendation is to use 92-octane gasoline. The engine compression ratio of this bike is 9.6:1, so 92-octane is completely sufficient and saves money. 95-octane costs more than 0.5 yuan per liter, which can add up to over ten yuan more per month. I've run 8,000 kilometers on 92-octane, with smooth starts and a fuel consumption of 2.1L. Just make sure to get fuel from a reputable gas station. There's no need to spend extra on 95-octane; it's more practical to save the money for oil changes.

[Bridget]

I've been using the UU125 for over three years and have tried both 92 and 95 octane gasoline. The 95 octane has better anti-knock performance, but our single-cylinder air-cooled engine has a relatively low compression ratio, so 92 octane is completely sufficient. Once, I filled up with 95 octane for a trip to the mountain city, and the fuel consumption actually increased by 0.2 liters. The mechanic said that using higher-octane fuel in small-displacement scooters can lead to incomplete combustion and carbon buildup. Now, I consistently use 92 octane at the town's gas station, and after over 30,000 kilometers, the engine is still running strong.

[DiSteven]

Brother Li from the neighbor's auto repair shop specifically explained this issue. The UU125 is factory-tuned to use 92-octane fuel, with its fuel system and electronic fuel injection designed accordingly. Switching to 95-octane may actually lead to incomplete combustion and is more likely to cause a gasoline smell during cold starts. The sticker inside the fuel tank cap clearly states 92-octane, which is just like following the instructions when taking medicine. Our fleet has over a dozen of the same model, and those consistently using 92-octane have 30% lower maintenance costs compared to those using 95-octane.

[NathanAnn]

Check the fuel section on page 7 of the new car manual—it clearly states in black and white that unleaded gasoline with RON92 or above is recommended. Old Zhang from the motorcycle shop says that using 95 octane for cars with a compression ratio below 10 is purely a waste, as the anti-knock advantage can't be utilized at all. Some customers didn't believe it and used 95 octane for half a year, only to find more severe carbon buildup when the engine was opened up. Saving five bucks per refuel adds up to enough for a bottle of full-synthetic oil in three months.