Light Front, Runs and Drives, Airbags Good., , For 2008, the R-Class lineup has two fewer models than it did in 2007, as the R63 AMG and R500 models have been discontinued. The gasoline R350 and diesel R320 CDI continue on. Both offer seating for up to seven. The Lexus RX and Cadillac SRX are among the R-Class competitors. Introduced for the 2006 model year, Mercedes says the R-Class grand sports tourer is the companys first model to blend the merits of a sport utility vehicle, sports sedan and luxury wagon.