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The problem with the axles is the the CV joints are directly above the cats. They heat up the grease and it slowly dribbles out when the boots age and leak slightly. The insidious thing about it is that it happens slowly and the cats burn it off. So you never notice it's leaking until they run out of grease. I was getting a hot oil smell in mine that drove me nuts for months--I couldn't find any leaks. I finally figured it out and had new clamps put on the boots.
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