Squeaky front end
 

My old girl has developed a squeak in the front end whenever I turn the wheel in either direction. It only does it when going real slow. I attempted to grease the bushings but they are sealed. Do I have to replace them, or is there a solution? The squeak is very
embarrassing, but the car is tight and the steering is good. She's a 1987 190E 2.3 16 valve with 190,000 miles and going strong. I'd
appreciate any help with this. James Griffith