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I've been a gear-head (racer, collector, etc..)all my life and have never really known different fuels to cause a problem, other than pinging, on newer cars. Until now, that is. I had been running the lower octane fuel in the Aurora then decided to begin running premium. After the first two tanks there was a noticeable difference in performance, smoothness, etc. Also, the fuel mileage picked up almost 2mpg. This car is one that definitely needs premium fuel and I'll never put the lower octane stuff back in it.

Answerit will more than likely PING when accellerating under load.if you mix fuel grades it should be ok. i run reg. all the time.no problem.
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โˆ™ 2011-09-13 12:16:35
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Q: What happens when regular fuel is used in a 1997 Oldsmobile Aurora instead of recommended premium fuel?
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