Since the VX has no zerks on the front end, I've always sprayed the rubber on the suspension parts (i.e. tie-rod ends, etc..) and the CV boots with silicon spray....usually twice a year...spring and fall...that way you keep the rubber soft and pliable and there is less chance of it rupturing and losing the grease within it. Once this happens the part will no doubt wear out and will need replaced.

I do this as well with my Fiero and it has 180,000 miles on it and the CV boots still look good!