I'm wondering if it's safe/acceptable to use regular, 87 octane gasoline in my Audi S5 Coupe, when it requires premium, 91 octane. Will there be any significant negative effects on the engine or performance?
ReplyYour Audi S5 Coupe is designed to run on premium, 91-octane gasoline, and you may see decreased performance and fuel efficiency if you use regular, 87-octane fuel. Additionally, using regular gas may cause engine knocking which can damage your engine in the long run.
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