The Buick Envision is reliable – but it’s mechanically identical to a Cadillac XT4, and shares a powertrain with the base model Chevrolet Blazer. So those are reliable too, right? As a brand, Buick’s advantage is incidental – what’s an unreliable component sold elsewhere at GM? The Cadillac twin-turbo V6? Buick doesn’t happen to sell that one.