Under FAR 23, which statement about engine oil and empty weight is true?

Under FAR 23, which statement about engine oil and empty weight is true?

• A. Engine oil is never included in empty weight.
• B. Engine oil capacity is optional in empty weight.
• C. The full engine oil capacity must be included in the empty weight.
• D. Engine oil is included only in certified aircraft after 2000.

Answer: (C)