Good morning Steve,
Most take out the BMW as very rarely does anything get turned down. Anything within reason obviously.
The diff, look for signs off oil on the garage floor after parking and around the output shaft seals. My O/S shaft bearing collapsed causing it too weep. I wouldn't say it got much noisier iirc, I just knew it was loosing oil and therefore not good. If you grab any of the shafts (keep it clean boys) and there's any kind of lateral movement, it's certainly worth a visit to BMW.
Other common parts include the Induction flap where the wee potentiometer usually packed up, rear springs are covered but the biggy that I have it for is the Engine and Gearbox which have been replaced under warranty by a few lads on here.
Hope this helps.
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My Car
2004 M3 CSL with Supersprint Lightweight Race and AP's front and rear 
Quote:
Originally Posted by Niel333
...One thing I know is the CSL is nothing like a normal M3 and I am loving it!!
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