Can I switch back to 95 after adding 98 gasoline?
2 Answers
It is possible to switch back to 95 after adding 98. Here are some relevant details about gasoline octane ratings: 1. Density of different octane ratings: Gasoline with different octane ratings has varying densities. The most common are 92 and 95 octane gasoline. The density of 92 octane gasoline is approximately 0.72g/ml, while 95 octane gasoline has a density of about 0.725g/ml, and 98 octane gasoline has a density of around 0.737g/ml. 2. Octane rating: Higher-octane gasoline contains more additives, and the density of these additives is greater than that of the base gasoline. Therefore, the higher the octane rating, the greater the density of the gasoline.
Last time I accidentally filled up with 98 octane gasoline at the gas station, but later switched back to 95 to save some money with no issues at all. Modern car engines have a smart brain called ECU that automatically adjusts ignition timing based on the gasoline's octane rating to prevent engine knocking or pinging. I drive an ordinary family car designed to be compatible with 95 octane fuel—98 is just for extra anti-knock properties, but it doesn’t significantly improve fuel efficiency or performance. You can switch back to 95 once the tank is empty. Mixing fuels isn’t a big deal either; the ECU adapts to different ratios, so no need to worry. I suggest avoiding frequent switching—occasional changes are fine, but check your manual to confirm if your car requires higher octane, especially older or turbocharged models. For daily driving, 95 is more cost-effective; no need to overspend.
