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  1. Just bought new, regular gas, undrivable

    CLA Maintenance / Care / Detailing
    My girlfriend just bought a 99 C Class and not knowing you have to use premium, put in unleaded. She had to head directly to a wedding so she hit the interstate and it started chugging and knocking. She drove it anyhow. I just got to the car and put some octane booster in the tank and managed to...