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Discussion Starter #1
What kind of gas should I use in my 82 el Camino it’s at 112,000 miles it’s a 3.8 v6 231 Buick motor. I’ve notice it backfires at a stop and go when I use 91 but when I use 87 it’s smooth ?? Does it really matter ??
 

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With your engine 91 is a waste of money. Stick with the 87.
 
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