A CV joint is packed with a special grease and sealed tight with the rubber or plastic boot, that is held in place with two clamps. A CV joint doesn't need any maintenance and can last very long, as long as the protective CV joint boot is not damaged.
Dannys Auto joints are protected by a rubber boot, a CV gaiter, usually filled with molybdenum disulfide grease. Cracks and splits in the boot will allow contaminants in, which would cause the joint to wear quickly.
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