What is the best gas grade for 1991 dodge dynasty?

Asked by Mar 05, 2017 at 10:17 AM about the 1991 Dodge Dynasty 4 Dr LE Sedan

Question type: General

What is the best gas grade for 1991 dodge dynasty?

6 Answers

105,535

Agree with TOM.

Mechanic recommended Sunoco 89 grade. My mpg is at 7.5

105,535

89 Octane won't hurt it, but if you are only getting 7.5 mpg it may need a repair or tune up. 89 Octane will likely not help the fuel mileage.

I had a recent tune up. New spark plugs pcv valve air filter oil change with very little improvement. Yesterday I purchased Sea Foam motor treatment and the salesman said mpg should improve at about half a tank. I hope so. The car runs very well but I'm having transmission problems Thank you

252,455

At 7 1/2 mpg I would use the cheapest gas I could find.

105,535

Sea Foam won't do squat. Just saying....

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