General Motors (GM) - Get Report reportedly is expanding its 0% interest and special-lease programs, in a new sign that U.S. auto sales are slowing.

As part of the expansion, the company will offer car buyers additional incentives of no money down and no payment for 90 days,

The Wall Street Journal

reported.

The GM deals and a marketing campaign that launches Friday called "Zero, Zero, Zero," come amid sluggish sales in the first 10 days of this month.

GM shares were up 5%, or $1.68, at $34.80 in midday trading Friday.