Types
Sealed ball joints do not require lubrication as they are "lubed for life", but most ball joints have grease fitting (sometimes called a grease zerk) and are designed for periodic addition of a lubricant. This is usually a very high viscosity lubricant. Generally speaking, standard ball joints will outlive sealed ones because eventually the seal will break, causing the joint to dry out and rust. Additionally, the act of adding new lubricant pushes out old and dry lubricant, extending the life of the joint.
Read more about this topic: Ball Joint
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