What are the consequences of long-term use of 92 octane fuel in Jetta VS5?

2 Answers
DiCharlotte
07/23/25 7:48pm
Long-term use of 92 octane fuel can easily lead to excessive carbon deposits affecting the car's power, and may even cause knocking. Introduction to gasoline grades: The grade of gasoline represents the octane rating of the fuel. The higher the grade, the higher the octane rating, indicating better anti-knock performance of the gasoline. Better anti-knock performance makes the engine run more smoothly, reduces wear, and provides better protection for the engine. However, higher fuel grades are not necessarily better. Hazards of mixing gasoline: If a car uses 95 octane gasoline, 92 octane gasoline should not be added. Adding lower-grade 92 octane gasoline will reduce the vehicle's acceleration performance and fuel economy, lower the engine's anti-knock performance, and decrease the engine's service life. The car engine's compression ratio is set according to the grade of fuel used. The compression ratio is an important structural parameter of the engine, representing the ratio of the gas volume when the piston starts compression at the bottom dead center to the gas volume when the piston finishes compression at the top dead center.
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LaKevin
08/10/25 5:53pm
I've been driving the Jetta VS5 and always use 92-octane fuel. The engine is designed specifically for 92-octane, so there's no issue with long-term use—no problems at all. The risk of knocking is low because the compression ratio is well controlled. The car runs smoothly, and fuel consumption remains stable. I've had the car for over three years now, driving on highways every week, and the power performance has always been consistent with no unusual noise or vibration. However, it's important to choose reputable gas stations to avoid clogged fuel injectors from low-quality fuel, which could affect performance. During regular maintenance, I check the spark plugs and air filter to keep them clean, reducing carbon buildup. Remember, don't waste money by mixing in higher-octane fuel—92-octane is cost-effective and reliable, saving you money while keeping you worry-free.
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