https://www.straitstimes.com/life/motoring/using-lower-octane-petrol-may-damage-engine-if-it-does-not-meet-carmaker-specifications?ref=more-on-this-topic
Octane ratings: Can lower-octane fuel damage your engine? | The Straits Times
Mar 27, 2026 - Using lower-octane fuel than recommended can cause engine knock and serious damage, costing more than fuel savings. Read more at straitstimes.com.
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https://www.streetdirectory.com/travel_guide/52061/mileage_and_fuel/what_are_gasoline_octane_ratings.html
What are Gasoline Octane Ratings
The recommended octane rating is usually specified in the vehicle owners manual as well as inside the fuel door of the vehicle.
gasolineoctaneratings