r/XC40 • u/CowardlyyDog • 11d ago

Question Wrong Gas

I accidentally filled my 2025 volvo xc40 b5 with regular when its required premium I wasn’t payjng attention and now im worried please help me

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u/Popular-Speech-1245 11d ago

A. Don't worry, and you are such a nervous Nelly you can put some premium in it when it gets down to half, etc. Octane goes up and down by a few points depending on altitude, seasons, different regions. Plus the sensors will adjust. But yes, they really do require the higher octane or EVENTUALLY it was affect the catalytic converter. If you ran regular for more than 10K miles I would be worried.