GM is a very "silo"ized company. Each one of their brand divisions operates (or used to, at least) with a large degree of engineering and production independence. Even as late as the 1990s, every one of GM’s major US divisions (Chevrolet, Pontiac, Oldsmobile, Buick, Cadillac) all had different non-interchangable engines, transmission options, drivelines/axles, even had dedicated manufacturing and assembly plants. Really quite a mess. As such, despite GM’s drive to have a more “unified” corporate lineup, there can still be wild variances between their different brands in terms of build quality and mechanical reliability.
So I looked into this a bit more. Buick only has 4 models currently and 2 dont have a Cadillac equivalent. 2 models do have a Cadillac equivalent but 1 of those two models is assembled at a different factory. Leaving only 1 model that shares a platform and assembly location (XT6/Enclave).
How is there such a big gap between Buick, Chevy, and Cadillac?
GM is a very "silo"ized company. Each one of their brand divisions operates (or used to, at least) with a large degree of engineering and production independence. Even as late as the 1990s, every one of GM’s major US divisions (Chevrolet, Pontiac, Oldsmobile, Buick, Cadillac) all had different non-interchangable engines, transmission options, drivelines/axles, even had dedicated manufacturing and assembly plants. Really quite a mess. As such, despite GM’s drive to have a more “unified” corporate lineup, there can still be wild variances between their different brands in terms of build quality and mechanical reliability.
So I looked into this a bit more. Buick only has 4 models currently and 2 dont have a Cadillac equivalent. 2 models do have a Cadillac equivalent but 1 of those two models is assembled at a different factory. Leaving only 1 model that shares a platform and assembly location (XT6/Enclave).
AFAIK, today every model has an equivalent model for at least one of the other brands. Except for the Corvette, I can’t think of any others.