I read a thread that suggested replacing the steering column bearings.
Never done this on any car I have ever owned.
Don't think it was a prank like a muffler bearing kind of thing.

My steering column is squeeky, and a little tighter than I would like.
I relieved some stress at the steering box adjustment and this helped.
Lubed the tie rod ends and other joints I could get a grease needle into.
Checked the power steering pump output pressure (1150 PSI, 79Bar).
Changed power steering fluid and filter.

So I thought I would go after and lube the steering shaft.
This is the 83 300SD. No airbag.

I could practice on the donor 300D. But thought I would ask first if doing this makes sense.

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80 300D 340K Owned 30 yrs
83 300SD 440K Owned 9 yrs - Daily Driver 150mi/day
02 Z71 Suburban 117,000
15 Toyota Prius 2600 miles
00 Harley Sportster 24k
09 Yamaha R6
03 Ninja 250