I've never heard that one before; what's your source?
AMG may have found a way to do the opposite; when I took my first, unmodified, E55K to MSL for a dyno run, with 125K miles up, it was making more power than stock...
Hi,
I used to work for a large manufacturer of diagnostic tools - the ones used by Mercedes, Renault, Peugeot, Fiat, Mitsubishi, Triumph motorcycles etc. - so worked closely with both the vehicle manufacturers and their fuel injection suppliers.
The software in modern ECUs is amazingly complex and I really had to chuckle when the VW "emissions defeat" story broke - if only people knew what the ECUs are actually capable of!
Cheers
Steve