Is vaseline a good o ring lubricant?

Vaseline, or petroleum jelly, is generally not recommended as a lubricant for O-rings, particularly in applications involving high temperatures or specific chemicals. It can degrade certain materials, potentially leading to O-ring failure. Instead, it's better to use lubricants specifically designed for O-rings, such as silicone-based or PTFE-based greases, which are compatible with a wider range of materials and conditions. Always check compatibility with the O-ring material before use.