Discussion
Which lubricant is used in a constant velocity joint?
Answer: B
Constant velocity joints use a special grease containing molybdenum disulphide, retained by the boot and packed in the correct quantity on assembly. Ordinary bearing grease is not adequate. Overfilling bursts the boot and underfilling starves the joint. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. The shared properties explain why these belong to one family, and the differences explain why more than one exists.
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