A "Sportline" version of your car (gas model) runs -1.2 degrees, so LOTS of negative camber is potentially allowable.

The first thing I'd want to do is to set both sides alike, i.e. both at -.9 (ideally with me sitting in the car). Usual suspects to bring your car back to OE would be lower control arm bushings, ball joints & top strut mounts...they are the primary wear items (but 100k sounds a bit early-just get the freebie alignment re-check; tell them the car "pulls")

__________________
"If God had meant for us to walk, why did he give us feet that fit car pedals?" Sir Sterling Moss

Michael
2014 E63S Estate
2006 SLK55
1995 E500
1986 Porsche 944 turbo