Driving in Sports mode isn't always harmful to your automobile, especially if you're only doing it for a short time. However, it will wear down your engine faster and use more gas than typical driving. You will put your engine under higher stress in Sport mode. However, as long as you don't use sports mode daily, it shouldn't significantly impact your vehicle. The biggest disadvantage of selecting sport mode is that it reduces gas mileage. Sport mode consumes more fuel than normal driving, so you'll spend more money on gas and use it up faster. This effect will not necessarily harm your car but may cause financial hardship.