Answer: Off-road can cause more problems for the car than street driving
Explanation:
In the above argument, the fact that extreme driving condition is used for off-road denotes the reason why it supposedly leads to a possible more damage to the car. There is however, a general habit that the car owners do not practise the regular oil change until their yearly maintenance, using the car off-road without the necessary preventive maintenance leads to more damages to the car during the yearly maintenance. This makes the answer to be "Off-road can cause more problem to the car than street driving".