What is the purpose of the spring in a lip-type oil seal?

Correct Answer: Option B — To keep the neoprene snugly fit around the shaft

The garter spring in a lip-type seal provides constant radial force to ensure the flexible neoprene or elastomer lip maintains intimate contact with the rotating shaft. This tension is critical for creating a reliable fluid barrier, preventing oil leakage despite minor shaft runout or material wear over time.