Honda Civic 2017 Owner's Manual page 38

2.0 L engine models
Unleaded petrol with a Research Octane
Number (RON) of 95 or higher is
recommended.
Is it possible to use unleaded petrol with a
Research Octane Number (RON) of 91 or
lower on this vehicle?
Vietnamese, Hongkong and Macau models
Use of lower octane petrol can cause occasional
metallic knocking noise in the engine and will
result in decreased engine performance.
We recommend that you use a research octane
of 98 or higher to maximize the performance of
the engine.
Use of petrol with a research octane less than
91 can lead to engine damage.
Except Vietnamese, Hongkong and Macau models
Use of lower octane petrol can cause occasional
metallic knocking noise in the engine and will
result in decreased engine performance.
Use of petrol with a research octane less than
91 can lead to engine damage.
The use of regular unleaded petrol can cause
metallic knocking noises in the engine and will
result in decreased engine performance.
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