Which of the following methods would produce the most reliable results when drawing a sample for lube oil analysis?
A) oil change: beginning of sump drainage
B) oil change: midway through sump drainage
C) engine running: syringe at mid-sump level
D) engine off, engine hot: syringe at mid-sump level

Question

Quizplus · Accepted Answer

The most reliable results are obtained when the engine is off and hot, and the sample is taken from the mid-sump level using a syringe. This method ensures that the sample is representative of the oil in the entire sump, and that it is not contaminated by other fluids or debris.

Which of the Following Methods Would Produce the Most Reliable