DETROIT — Buick, the rock upon which General Motors was built more than a century ago, appears to be fading in the company’s rearview mirror.

As of the 2019 model year, the Buick name is no longer stamped across the back of its North American models. In China, where Buick claims most of its sales these days, the “Buick” nameplate disappeared years ago. The brand’s logo is all that’s left, and soon, the company might be gone from the car business altogether — making only S.U.V.s and crossovers.

It seems that, after 115 years, the name’s image has become too outdated for a company that wants to be thought of as a thoroughly modern “attainable luxury” vehicle in a class with Acura, Infiniti, Lincoln and Lexus, a notch below high-end offerings like Cadillac.

The company has gone so far as to produce advertisements that explicitly distance the brand from its reputation. “That’s not a Buick” spots were placed in high-profile slots, like the Super Bowl, to drive home the point.