🔍 Key Concepts

• Effect of water contamination on the appearance of lube oil • Normal color and clarity of clean lube oil in an operating engine • How emulsified water changes oil appearance compared to soot or oxidation

💭 Think About

• Think about what happens when you vigorously mix water with oil—what kind of visual change do you see? • Which color best matches lube oil that is clean, filtered, and at the correct operating condition? • Which option sounds more like burned/oxidized oil or rust contamination rather than water?

✅ Before You Answer

• Identify which choice suggests an emulsion (oil and water mixed so it loses transparency) • Eliminate any colors that indicate normal, clean oil appearance • Consider which color would be more consistent with soot, wear metals, or oxidation instead of water