Ever since I bought my 07 Cls550, it's been wearing out tires every 15,000 miles, approximately. Due to the tire wearing on the inner edge. Lowering the car obviously made it even worse.
Looking through the service records I have since the car was new, it's been going through tires at an accelerated rate.
I had the car aligned & had them set the toe to 0° because I've always been told it's bad toe angle that speeds up tire wear, camber will only wear uneven. That's officially B.S., I corded all 4 bridge stone extreme contacts in 11,000 miles of normal driving.
That was after new tie rods & the alignment.
Front - 0° toe, -1.9 camber, caster 10.9°
Rear - 15° toe, -1.8 camber

Installed all bushings & ball joints along with new concentric bolts in the front lower control arm that should allow for +/- 2° of camber. Also found the front Adjustable upper ball joint camber kits on ebay. Surprisingly, I didn't find any info on them or instalation / review videos but figured it's worth a shot.

I finally got them installed today. Everything went as expected when replacing a upper ball joint. The only issue I had was I has the grind about 2-3 mm's off the inside corner of both control arms to allow room for the top of the ball joint adjustment plate to slide smoothly through the control arm. You must have to stamped metal upper control arms with bolt in ball joint.
Apparently some models are a one piece upper control arm & non replaceable ball joint.

I haven't had it aligned yet but with the ball joint kit & the concentric bolts, it looks like the wheels are finally straight. According to my phone bubble level, I'll be able to adjust camber from +.5° to -3.0° approximately. Curious as to how accurate the bubble level app is compared to an actual alignment machine lol.

I circled the corner piece of the control arm I had to grind off.