If my valve cover gasket is leaking, but not enough to actually leave a drop of oil on the ground, does it need to be replaced? The dealership quoted me $260 to replace it. Also my dealership said the CV boots are slinging grease and they recomend replacing the front axle for a little over $800. Will the slinging grease really cause that big of a problem to warrant replacing the axle? This is the first nice car I have owned so I'm trying to keep it well maintained, but I want to make sure I'm not getting taken.