All of the Following Statements Are True EXCEPT

Multiple Choice

All of the following statements are true EXCEPT:

A) sludge in the oil will increase if the engine is running at too cold a temperature for too long.
B) sludge is a mixture of moisture, by-products of combustion, and water.
C) high emissions and poor fuel economy result when an engine does not reach operating temperature.
D) when an engine is warm, the thermostat is always open fully.