Question

The sludge formation takes place as a result of operation at low engine temperatures during starting, warming up, and idling periods.

(a) True

(b) False

I have been asked this question during an interview for a job.

This intriguing question comes from Properties of Lubrication topic in chapter Engine Friction and Lubrication of IC Engine

Answer 1

The correct answer is:

(a) True

Sludge formation occurs as a result of operation at low engine temperatures, particularly during starting, warming up, and idling periods. At low temperatures, the engine oil may not fully circulate or reach the optimal temperature, causing the oil to be less effective at removing contaminants. This can lead to the formation of sludge, which is a mix of oil breakdown products, dirt, and unburned fuel.