Which of the following statements regarding changing vacuum pump oil change interval is NOT correct?
A. Vacuum pump oil should be changed whenever a system is evacuated on a system known to have high moisture content.
B. Vacuum pump oil should be changed whenever a system is known to have been contaminated is evacuated.
C. Vacuum pump oil should be changed after each use.
D. Vacuum pump oil should be changed whenever the pump will not pull to the desired level of vacuum.
Answer: C
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