Had the car up on the car shop's hoist while looking for an exhaust leak. Found that but the tech pointed me at the zerks for greasing the ball joints. He noted that they were all rusted over and looked like grease had never been applied. He asked if I felt any wobble or looseness in the handling (probably wondered if there had been excessive wear without re-lubing).
If the zerks are rusted and can no longer be used and if penetrating oil or torching them to heat them up doesn't work, well, just unscrew the old ones to screw in the new ones. My concern is how often are the ball joints supposed to get greased. Although there are zerks, some folks claim the ball joints are sealed and don't get re-lubed. If that were true, why are there zerks and rubber boots?
I also noticed one of the boots (that protects the grease) is slipping off. Do the ball joints have to get removed to put on new boots? That would be labor intensive hence costly. If no boots need replacing, what might be the price at the car shop to have them go around to all the zerks to lube them up? I can buy a grease gun (can't find my old one) and a cartridge at maybe $15 but I'd have to crawl underneath. If they charged something like $25-$35, I'd pay the shop instead of me doing the job. I quit changing my engine oil and filter long ago. Plus I wouldn't be using the grease gun for so long that I'd new new lube the next time and probably couldn't find the gun again.
The manual says only to inspect at 60K and 120K miles. The car has about 83K. It is old but annual mileage is very low. In fact, the car was bought used as a 2-year old with 60K already on it, so only 23K has been added over 13 years (~1.8K/year). Don't know if this ever got inspected before and the rust on the zerks sure makes it look like they never got greased.