Tire wears oddly!
 

This is getting tireing and expensive. My front tires on my 1989 300te wear on the outer edge. Mostly the right front. I can go through a tire in a year. It has been aligned 2x by two different shops. Each time I get excited that the problem will not return. I keep all my tires inflated to 32psi. Any ideas?

You are not alone.

I just replaced a set on my W124 this weekend that lasted about 9000 miles...but ALL FOUR tires wore down to no tread within that timeframe!!

I noticed the shorter tire lifespan about the time I suspected that the front shocks (struts) needed replacing. Also the shock towers might be an issue.

Check for leakage on the shocks and cracked rubber on the towers...

Bushings, bushings everywhere! And how old are they?
 

Been there...

There are soooo many bushings in the suspension [including those for spring mounts] as well as the those for chassis to subframe that can effect the alignment geometry. You need a dealer or very good inde with alignment machine who will inspect everything. Fortunately, your front A arms have replaceable bushings. Those of use who have 94 & 95 wagons get to replace the entire A arm.

How many bushings on your "20" year old car are original?

Also check for bent wheel[s] and your data plate for front & rear air pressure. My 94 Wagon is much higher rear than front.

You're about due for Re-Rubberization.(Bushings,not tires)
 

Also,It's near impossible to find anyone Except a Mercedes dealer who knows
how to align these chassis properly.

I have the same wear on my wagon too. It is being caused by the rear control arms for me.

I had the same issue on my W140. The right front tire was wearing on the outside. After two alignments didn't fix the problem I took it to the dealer where they diagnosed a bad wheel bearing.