If your X is still at the dealers, ask the shop foreman if you could have a look at the CV boots yourself. Preferably up on a hoist where you could just walk in underneath and inspect said boots. Any decent mechanic will let you have a close up peep, as long as they don't have insurance restrictions in denying you/joe public workshop access. Take a rag and wipe down around the clips as well, should be nice n dry. Obviously look for cracks and or tell tail signs of grease spots on the rubber boots.

Do a search, tons of info on CV boots. GL

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