🔍 Key Concepts

• Viscosity and what it means for lube oil thickness/flow • Common causes of lube oil viscosity increasing versus decreasing • How fuel dilution or contamination affects lube oil properties

💭 Think About

• Ask yourself: which choice would make the oil thinner and more "watery," not thicker? • Which options would normally lead to more solids or heavier molecules in the oil, and would that raise or lower viscosity? • Think about what happens to lube oil if unburned fuel leaks past the piston rings into the crankcase.

✅ Before You Answer

• Be clear on the difference between loss of additives and contamination of the oil. • Consider whether carbon deposits would logically make oil thicker or thinner. • Think about whether centrifuging removes or adds anything that would change viscosity suddenly.