Question As part of the vehicle inspection test, a CDL applicant may be asked to: Answers Check the engine oil level. Replace a tire. Remove the alternator belt. Replace spark plugs. Explanation While testing for a CDL, an applicant will be required to go through a full vehicle inspection. The vehicle inspection test will include an engine oil level check. Take a FREE Practice Test Now This questions appears in the following tests: Colorado Knowledge Test Class A , Georgia Knowledge Test Class A , Minnesota Knowledge Test Class A , Nevada Knowledge Test Class B ,