A major symptom of bad gas is … Symptoms of Bad Gas in a Car by Jason Medina Updated October 25, 2017. Engine Pinging. You can stop worrying about using cheap gas.

A gasoline-powered engine needs a combination of both gasoline and air in order to start and run. More additives essentially afford more engine protection — but they also cost more.

Bad gas can seriously disrupt normal engine operation and cause a variety of performance-related symptoms. Many experts say it's unlikely to hurt your car.

Clean, high-quality gas is necessary to maximize engine operation.