In engines with variable valve timing (VVT), what is the main performance benefit, and what maintenance issues can affect VVT operation?

In engines with variable valve timing (VVT), what is the main performance benefit, and what maintenance issues can affect VVT operation?

• A. Improves torque and efficiency across RPM by varying valve timing.
• B. Only improves idle quality at low RPM.
• C. Eliminates the need for camshaft timing adjustments.
• D. Reduces engine displacement for efficiency.

Answer: (A)