What should be done if a CV joint boot is found to have a small split?

Replacing the boot is the appropriate action if a CV joint boot is found to have a small split. The CV boot is crucial as it contains grease that lubricates the CV joint and protects it from dirt and debris. A small split allows grease to escape and contaminants to enter, which can lead to premature wear or failure of the CV joint over time.

By replacing the boot, you restore the protection and lubrication, which can extend the life of the CV joint. It's a preventive maintenance step that addresses the issue before it escalates into a more costly repair, such as needing to replace the entire half-shaft assembly due to joint failure.

Other suggested actions, such as sealing it with ATV or Permatex, may provide a temporary fix but do not address the underlying issue of the compromised boot structure. Additionally, replacing the half-shaft assembly takes a much more extensive approach and is not warranted if the only issue is a small split in the boot.