Mercedes-Benz plans a big expansion of its diesel lineup in the US.
The German carmaker aims to regain its place as the top importer of diesels in the US, a position it held from the 1960s to the mid-1980s.
Mercedes sold about 4,000 diesels in the US last year, compared with 25,000 for Volkswagen.
Four Mercedes models - the E-class sedan, M-class and G-class SUVs, and new R-class crossover - are expected to be offered with diesel power.
At least two Chrysler group vehicles, the Chrysler 300 and Jeep Grand Cherokee, also could get diesel options.
Just five diesel-powered car models, including Mercedes' E320 CDI and two small diesel SUVs, now are available in North America.
Mercedes' plans perhaps signal a broader move to diesel cars in the US where less than 1 percent of passenger vehicles are diesels.
As gasoline prices soar in the US, automakers are taking a close look at diesels, which deliver about 30 percent greater fuel economy than a similar-sized gasoline engine.
Mercedes plans to meet tough new US emissions standards that require diesels to run as cleanly as gasoline engines with an injection system that shoots urea - an ammonia-like acid - into the exhaust system.
"We are working really hard to have the solution ready for the new regulations that will come in 2007-2008," says Eva Lenhardt, head of technology communications for Mercedes Car Group in Stuttgart.
Urea changes oxides of nitrogen (NOx), the precursor of smog, into harmless nitrogen and water. Mercedes calls the system SCR, short for Selective Catalytic Reduction.