Should Audi use 95 or 98 octane fuel?
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Audi vehicles require a minimum of 95 octane gasoline, while some high-performance Audi models require 98 octane fuel. The differences between 98 and 95 octane fuel are as follows: Different anti-knock combustion capabilities: 98 octane gasoline has better anti-knock properties than 95 octane gasoline. Different octane ratings: 95 octane gasoline consists of 95% isooctane and 3% n-heptane, while 98 octane gasoline is a mixture of 98% isooctane and 2% n-heptane. Both 95 and 98 octane fuels are high-grade gasoline. Compared to 95 octane, 98 octane gasoline has a research octane number that is 3 units higher. Increasing the octane rating of unleaded gasoline by one unit requires greater technical difficulty and higher processing costs. Therefore, high-grade gasoline is priced higher than regular gasoline.