🔍 Key Concepts

• Function of piston rings in sealing combustion gases and controlling lube oil on the cylinder walls • Relationship between ring condition and oil flow/consumption in the cylinder • How poor sealing affects combustion and oil behavior (blow-by, oil burning)

💭 Think About

• Think about what happens to the seal between the piston and cylinder wall when the rings are badly worn. • How would worn rings change the amount of lube oil that gets into the combustion space and what happens to that oil? • Which option describes a result of oil getting past the rings, rather than a change in oil properties like viscosity or temperature?

✅ Before You Answer

• Does the choice describe something that would logically happen if more oil escapes past the rings into the combustion chamber? • Make sure you are distinguishing between oil being used up vs oil becoming thicker or thinner. • Eliminate any options that don’t clearly connect to leakage of oil or gases past worn rings.