Saab uses a Trionic 8 ECM for their vehicles. It's adaptive, and learns what's not right so if you try to make changes to it, it'll revert back to what it's programmed to do. Duramax's Allison transmission has the ability to basically do what it wants and if you try to command something different (even through EFI Live) it may still do what it wants. BMW uses an ECU that can detect a non-factory calibration loaded in on the S54 engines and can basically find a way to keep things where the factory cal is. My point being, these are measures that are created by manufacturers to keep people from easily messing with shit and then when something bad happens they bring it back and try to cry foul and want their warranty. Apple is no different in the aspect. So why all the bitching? It's quite retarded. If you want to find your way around the issue, do it by buying the right tools and quit your bitching. That's what a missing dipstick has to do with this thread. Now. GTFO.