From Mercedes Wiki

The Mercedes-Benz W251 is an Automobile sold as the R-Class. It is a crossover vehicle, similar to Multi-purpose vehicle but also to Crossover SUV. Based on the W164 M-Class SUV, it was introduced in 2005 as a 2006 Model year.

R63 AMG

The AMG version of the W251, the R63 AMG, was introduced at the 2006 North American International Auto Show as a 2007 model. It features a 6.2 L V8 engine producing 503 hp (375 kW) and 465 ft·lbf (630 N·m) of torque. Mercedes-Benz's 7G-Tronic seven-speed Automatic transmission is standard.

v • Mercedes-Benz vehicles • e « previous — Mercedes-Benz road car timeline, 1980s–present
Type	Class	1980s										1990s										2000s
		0	1	2	3	4	5	6	7	8	9	0	1	2	3	4	5	6	7	8	9	0	1	2	3	4	5	6	7	8	9
Small family car	A																		Mercedes-Benz W168								Mercedes-Benz W169
Compact executive car	C			W201 (190)												Mercedes-Benz W202							Mercedes-Benz W203						Mercedes-Benz W204
Executive car	E	W123						W124									W210								W211
	CLS																									W219
Full-size car	S	W126											W140								W220							W221
Roadster	SLK																			R170								R171
	SL	R107									R129														R230
Coupé	CLC																													CL203
	CLK																			W208					W209
	CL			C126										C140							Mercedes-Benz C215							C216
Supercar	SLR																										C199
Off-road vehicle	G	W460											Mercedes-Benz W461
	G											W463
Sport utility vehicle	GLK																												X204
	M																			W163								W164
	GL																											X164
Multi-purpose vehicle	B																										W245
	R																											V251
	Mercedes-Benz Vaneo																							Mercedes-Benz Vaneo
Light commercial vehicles	Vito																	Vito										Vito
	Sprinter																Sprinter