"This warranty further addresses the needs of American buyers head-on," said Volkswagen Group of American chief executive Hinrich Woebcken.
VW said most other major rivals offer a 36,000 mile, three-year warranty on similar SUVs.
The longest warranty is now offered by Hyundai Motor Co and its Kia Motors Corp affiliate. That warranty extends 60,000 miles or five years.
The powertrain warranty is 100,000 miles, but it only lasts five years or 60,000 miles if transferred.
The German automaker has been struggling to recover since it admitted in 2015 the company installed secret software that allowed vehicles to cheat emissions tests for six years.
The new VW warranty is twice as long as the current three-year 36,000-mile warranty on the Tiguan. The Atlas is a new model.
VW brand U.S. sales this year are up 10 percent this year, but fell 8 percent in 2016 to 323,000 vehicles after falling 5 percent in 2015.
The automaker halted all U.S. diesel sales in late 2015.