I'm Using Vpower 97 Octane before, but its too expensive, but now I'm using Petron XCS 95 Octane. I want to try using Shell Unleaded 93 Octane is there any difference? Are there chances that my engine will fail due to lack of Gasoline Octane? This will help me to lessen my gasoline expense I'm using Subaru Impreza 2.0R AT its like 5km/L. Thats why I want to switch with unleaded. Thanks guys for comments and suggestions.


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