I've had no issues mechanically or with any warranty work its had done. That being said, the only thing that's ever been done to the engine was the Vanos and was long before I changed to an after market filter however, it has been serviced twice with it fitted and never been mentioned to me.
Good thing is, you can clean and oil it as many time as you want/need to for very little cost. Noise/performance wise I have to say, there is little to no difference. Maybe, just maybe a tiny wee bit more induction bark but that's about it.
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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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