Until very recently GM
has not done a lot of sharing between the European product and North American product. Which means that the platforms between the two markets are unique and engines (to a degree) as well.
But this is all changing. The new epsilon platform is the basis for the new Vectra, 9-3, Chevy Malibu, Pontiac Grand Am, and the eventual replacement for the Saturn L series (which itself is an enlarged Vectra).
Additionally the 2.0 Ecotec four (for better or worse) is being standardized across lines as the primary engine in the medium sized cars. V-6s are another issue. The NA
market Malibu and Grand Am will be using a new 3.5 liter OHV 60 degree 6. I presume it is based off of the current lineage of the 2.8, 3.1 and 3.4 liter engines. Some NA
market cars are seeing the Ecotec sixes... notably the 2.5 liter in the L series and 3.2 liter in the CTS. Which will be getting a 3.6 liter version for '04.
By 2010 differences between Opels, Vauxhauls, Holdens, Chevys, et al will definately go away. GM
just has way too many brands, too many platforms, and too many engine families. Ford has certainly done a much better job in that regard.
Stop drop and roll will not save you in hell. --- seen on a church marque in rural Virginia