San Antonio Express-News All About Cars column.

By G. Chambers Williams III, San Antonio Express-News Knight Ridder/Tribune Business News

Feb. 19--Two new luxury cars are on the way from General Motors.

In the continuing renaissance of its two most-upscale divisions, Buick and Cadillac, GM later this year will roll into showrooms two all-new full-size sedans: the Cadillac DTS, replacing the long-running DeVille; and the Buick Lucerne, which replaces the once very-popular LeSabre.

Although both are designed to help the two brands retain some of the loyal older customers, the DTS seems aimed almost entirely at the over-60 crowd, with no obvious features to appeal to younger buyers.

The Lucerne, on the other hand, appears to be seeking a slightly younger clientele -- perhaps beginning in the upper 40s -- one for which it would compete head-on against such cars as the Lexus ES 330 and the redesigned 2006 Toyota Avalon.

This strategy is understandable. Cadillac already has a full stable of new vehicles designed for younger buyers, and its older traditional customers have been getting a bit nervous of late, wondering if the DeVille would get the same kind of youthful styling that has made Cadillac the darling of the thirty-something and baby boomer sets these days.

No need. The company has …