In diagnosing air intake issues, which method is used to detect a leak by analyzing lube oil for silica?

In diagnosing air intake issues, which method is used to detect a leak by analyzing lube oil for silica?

• A. Lube oil analysis
• B. Compression test
• C. Fuel pressure test
• D. Oil viscosity test

Answer: (A)

Lube oil analysis is used to spot contaminants that come from outside the engine, such as dust in the air. If there’s an air intake leak, dusty air can be drawn into the engine and the silica particles end up in the lubricant anyway, increasing the silica content in the oil. Detecting elevated silica in the oil points to an air leak in the intake or related paths, making this method the best choice for diagnosing air intake issues. The other tests don’t target particulate contamination: a compression test checks cylinder sealing, a fuel pressure test checks the fuel system, and an oil viscosity test looks at the oil’s flow properties rather than contaminants.

Lube oil analysis is used to spot contaminants that come from outside the engine, such as dust in the air. If there’s an air intake leak, dusty air can be drawn into the engine and the silica particles end up in the lubricant anyway, increasing the silica content in the oil. Detecting elevated silica in the oil points to an air leak in the intake or related paths, making this method the best choice for diagnosing air intake issues. The other tests don’t target particulate contamination: a compression test checks cylinder sealing, a fuel pressure test checks the fuel system, and an oil viscosity test looks at the oil’s flow properties rather than contaminants.