If the boot is intact and the joint not loose there is no reason not to squirt grease in with a needle fitting on the grease gun. I have done it many times and gotten extra years out of the ball joints. It is often one of the first things I do to a newly aquired old benz.

Tom W

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.