Which of the Following Statements Is LEAST-Likely to Be True

Multiple Choice

Which of the following statements is LEAST-Likely to be true?

A) A diesel engine can run at idle with a very lean air-fuel mixture and can be about one-third more efficient on fuel.
B) In diesel engines, the amount of air remains the same, and changing the fuel mixture controls speed and power.
C) Diesels are difficult to start in cold weather.
D) Diesels require less frequent oil changes than gasoline engines.