What are the consequences of using 92 octane gasoline in a Tiguan?
2 Answers
If a Tiguan uses 92 octane gasoline, it may result in reduced engine power and increased fuel consumption. The turbocharged engine in the Tiguan can experience knocking when using 92 octane gasoline. Additional information is as follows: 1. Gasoline octane rating: Different grades of gasoline have varying octane ratings. Higher-grade gasoline has a higher octane rating, and gasoline with a higher octane rating is more stable. 2. Hazards of using the wrong gasoline: Most cars with turbocharged engines require high-octane gasoline because turbocharged engines operate at higher internal temperatures and pressures. Using low-octane gasoline can easily cause engine knocking. Knocking occurs during the compression stroke. During the compression stroke, both the intake and exhaust valves of the engine are closed, and the piston moves upward to compress the air-fuel mixture. The temperature and pressure of the compressed mixture increase. If the gasoline is not stable enough, the mixture may ignite prematurely. Premature ignition of the mixture pushes the piston downward while it is still moving upward, affecting the engine's power output and fuel economy. Severe knocking can even lead to piston fracture or connecting rod deformation.
When I was driving my Tiguan, a friend mistakenly filled it with 92-octane gasoline. The car noticeably lacked power and the engine shook severely at idle. After taking it to the repair shop, the mechanic explained that low-octane fuel in turbocharged engines like the Tiguan's can easily cause knocking, and in severe cases, may damage components, with repairs costing at least several thousand yuan. Later, I checked the manual and learned that the manufacturer recommends using 95-octane or higher fuel. Long-term use of incorrect fuel grades can lead to carbon buildup issues, which are expensive and troublesome to clean. I advise everyone to check the fuel grade before refueling—don't try to save small amounts of money only to spend big later. Developing good habits can save you a lot of maintenance headaches.
