[Mandarin Man]

Was at the dealer last week, got chatting to the service manager and he told me a couple of pieces of info I didn't know which might be useful to someone.

#1 I've read in a few places that the engine in the G20 320i and 330i is exactly the same, it's just the ECU that determines the different outputs. Not true according to service guy; the 320i engine doesn't have the piston head cooling of the 330i. So while the 320i ECU can be remapped, there's a much higher chance of blowing the engine.

#2 I've also read that coding etc is not traceable by the dealer as long as it's returned back to factory values before servicing etc. Again not true according to service guy. The BMW code stack is checksummed at the factory and after each service, and although they couldn't necessarily tell *which* values had been modified, they can definitely see that *some* have (because the checksum is different) - and this will most definitely invalidate drivetrain warranty repairs, and probably the insurance as well (at least in NL).

I thought maybe valuable to post here as it's contrary to a number of posts I've read.