What information can be obtained from engine oil analysis in EVT maintenance, and what actions might result?

• A. It can determine the exact cause of engine failure without further testing.
• B. It helps determine oil viscosity only and triggers no action.
• C. It can reveal wear metals and contaminants indicating engine wear or coolant/fuel intrusion; may trigger an oil change, further diagnostics, or component replacement.
• D. It is only used to determine oil color.

Answer: (C)

Engine oil analysis tells you what’s happening inside an engine by looking for wear metals and contaminants in the oil. The metals come from engine components that are wearing, such as bearings, gears, and piston-related parts, while contaminants can indicate coolant intrusion or fuel dilution. By evaluating which metals are present and in what amounts, and how those levels change over time, you can spot developing wear or leaks early and identify possible sources.

Based on the results and trends, the typical actions include changing the oil, performing additional diagnostics (like cooling-system tests, compression checks, or fuel-system checks), or replacing worn components such as bearings, seals, or gaskets. This is a diagnostic tool to guide maintenance decisions rather than a single definitive cause of failure.

Why the other options don’t fit: oil analysis doesn’t determine an exact cause of engine failure on its own, it analyzes more than just viscosity and often leads to further actions, and oil color alone is not a reliable indicator of condition.