Is it okay to occasionally use 92 gasoline in a car designed for 95?
1 Answers
Occasionally using 92 gasoline in a car designed for 95 is acceptable, but long-term use of the wrong fuel can lead to insufficient anti-knock performance, increased engine failure rates, higher fuel consumption, more carbon deposits, and clogged fuel injectors. Reason Analysis: Normally, the fuel cap of a vehicle indicates the recommended fuel grade, and you should use that grade or a higher one. It is not advisable to use a lower grade. Cars designed for 92 gasoline can use 95 gasoline, but cars designed for 95 gasoline should not use 92 gasoline. The main difference between different fuel grades lies in their anti-knock performance, which is a crucial indicator of fuel quality. 92 gasoline has an octane rating of 92 and is suitable for mid-range cars (with lower compression ratios). 95 gasoline consists of 95% isooctane and 5% n-heptane and should be used in engines with higher compression ratios. 98 gasoline has an octane rating equivalent to a mixture of 98% isooctane and 2% n-heptane. The advantages of 98 gasoline are "two highs and two lows": higher anti-knock performance and power output, along with lower harmful substances and exhaust pollution. Long-term Effects of Using the Wrong Fuel Grade: Using a higher-grade fuel in a car designed for a lower grade will not cause damage, but the increased octane rating can alter the fuel's ignition point, leading to delayed combustion in the engine. This reduces the engine's power output and thermal efficiency. Conversely, using a lower-grade fuel in a car designed for a higher grade can cause engine knocking, increased resistance during the power stroke, abnormal wear on the piston and cylinder, and in severe cases, cylinder scoring.
