Noise while steering.
My '86 300E makes "groaning/squeeking" noise when I turn the wheel for a left or right turn. It sounds like it's coming from inside the steering column, or is it being transmitted via the steering linkage? I noticed all the ball/bushing points on the steering linkage do not have any zerks for greasing. With 134K miles, is it time to replace them or should I be looking elsewhere? Thanx.