fuzzybabybunny Posted September 14, 2016 Share Posted September 14, 2016 So the compression ratio of these engines seems to be anywhere from 10:1 to 12:1. As far as I know, higher octane gasoline simply delays spontaneous detonation until higher compressions. That and it has some additives to clean fuel injectors and stuff. But is 98 octane really necessary? Can I fill it with the same octane that my car uses, 91? During the first few weeks of owning the motor I didn't know any better and ran probably 20 liters of 91 octane fuel through it with no problems. What about even lower octane like 87 or 85 that you can find in the US? Quote Link to comment Share on other sites More sharing options...
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