Question about 1987 Volvo 740

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What is the unleaded fuel button on the volvo 740 turbo? I just got a 91 Volvo 740 turbo, and it has a button on the dash that says unleaded fuel. If i push it, it makes a weird buzzing sound. SHould I be using unleaded fuel in this car, or premium?

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85 octane is all you need unless you are at sea level then use 87 octane...

Posted on Jul 14, 2009

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