Question Without oil in its engine: Answers A vehicle will likely run smoothly. A vehicle will make quick jerks while driving. A vehicle's engine may be damaged quickly. A vehicle's gas mileage will improve. Explanation An engine can be rapidly destroyed if it is run without oil. If its oil pressure gauge is low or fluctuating, do not operate a vehicle. Take a FREE Practice Test Now This questions appears in the following tests: Illinois Knowledge Test Class A , South Dakota Knowledge Test Class B , Oregon Tank ,