Which impact may result from excessive engine wear and tear?

• A. Increased vehicle resale value
• B. Better engine tuning capabilities
• C. Higher emissions levels
• D. Improved fuel economy

Answer: (C)

Excessive engine wear and tear can lead to higher emissions levels primarily because of the degradation of engine components. When parts like piston rings, valves, and seals wear down, they may not function as efficiently or effectively as they should. This can cause incomplete combustion of fuel, leading to unburned hydrocarbons and other harmful pollutants being emitted from the exhaust system. Additionally, a worn engine may struggle to maintain optimal air-fuel ratios, further contributing to increased emissions.

In contrast, other impacts mentioned in the choices do not align with the effects of engine wear and tear. For instance, increased vehicle resale value and improved fuel economy generally result from a well-maintained engine, not one that has suffered excessive wear. Furthermore, better engine tuning capabilities typically stem from optimal engine performance and condition rather than from wear.