Mercedes-Benz Engine

OM642

The Mercedes-Benz OM642 is a DOHC V6 diesel piston engine.

Years
2005–present
Configuration
V6
Fuel
Diesel
Top power
265 PS
Mercedes-Benz OM642 V6 engine

The 3.0-liter diesel V6 that replaced a generation of inline CDI fives and sixes — shorter, smoother, and the backbone of BlueTEC.

Series production began in spring 2005 after roughly forty months of development. A 72° aluminum block with cast-in liners, DOHC four-valve heads, a balance shaft between the banks, and offset crankpins for even 120° firing intervals packed third-generation common-rail (piezo injectors at up to 1,600 bar) and a Garrett variable-nozzle turbo into a package short enough for the C-Class. Compression fell in stages from 18:1 in early engines to 15.5:1 in later LS and SCR versions; early car outputs clustered around 165–190 kW with well over 500 N·m from low revs — and it was the first Mercedes diesel offered with 7G-Tronic.

From the C 320 CDI and E 320 CDI through ML, GL, R-Class, vans and later BlueTEC SCR applications, the OM642 spanned passenger cars, SUVs and commercial chassis into the 2020s. It also powered Chrysler, Jeep and Freightliner cousins before the modular OM656 inline-six took over Stuttgart's diesel flagship role.

Versions.

Every factory version of the OM642.

VersionDisplacementBore × StrokeCompressionPowerTorque
642.820 (DE 30 LA)2,987 cc 83 × 92 mm 16.5150 kW (201 hp; 204 PS) at 3,800 rpm500 N·m (369 lb·ft) at 1,400 rpm
642.820 (DE 30 LA)2,987 cc 83 × 92 mm 16.5155 kW (208 hp; 211 PS) at 3,400 rpm540 N·m (398 lb·ft) at 1,600 rpm
642.820 (DE 30 LA)2,987 cc 83 × 92 mm 16.5170 kW (228 hp; 231 PS) at 3,800 rpm540 N·m (398 lb·ft) at 1,600 rpm
642.8222,987 cc 83 × 92 mm 15.5195 kW (261 hp; 265 PS) at 3,800 rpm620 N·m (457 lb·ft) at 1,600 rpm
642.8262,987 cc 83 × 92 mm 15.5190 kW (255 hp; 258 PS) at 3,600 rpm620 N·m (457 lb·ft) at 1,600 rpm
642.8322,987 cc 83 × 92 mm 17.7170 kW (228 hp; 231 PS) at 3,800 rpm540 N·m (398 lb·ft) at 1,600 rpm
642.8342,987 cc 83 × 92 mm 15.5195 kW (261 hp; 265 PS) at 3,800 rpm620 N·m (457 lb·ft) at 1,600 rpm
642.8352,987 cc 83 × 92 mm 15.5195 kW (261 hp; 265 PS) at 3,800 rpm620 N·m (457 lb·ft) at 1,600 rpm
642.8362,987 cc 83 × 92 mm 15.5170 kW (228 hp; 231 PS) at 3,800 rpm540 N·m (398 lb·ft) at 1,600 rpm
642.838 (D 30 LS)2,987 cc 83 × 92 mm 15.5195 kW (261 hp; 265 PS) at 3,800 rpm620 N·m (457 lb·ft) at 1,600 rpm
642.838 (D 30 LS SCR Europa)2,987 cc 83 × 92 mm 15.5185 kW (248 hp; 252 PS) at 3,600 rpm620 N·m (457 lb·ft) at 1,600 rpm
642.838 (D 30 LS SCR Europa)2,987 cc 83 × 92 mm 15.5190 kW (255 hp; 258 PS) at 3,400 rpm620 N·m (457 lb·ft) at 1,600 rpm
642.850 (DE 30 LA)2,987 cc 83 × 92 mm —150 kW (201 hp; 204 PS) at 4,000 rpm500 N·m (369 lb·ft) at 1,600 rpm
642.850 (DE 30 LA)2,987 cc 83 × 92 mm 15.5170 kW (228 hp; 231 PS) at 3,800 rpm540 N·m (398 lb·ft) at 1,600 rpm
642.850 (D 30 LS)2,987 cc 83 × 92 mm 15.5195 kW (261 hp; 265 PS) at 3,800 rpm620 N·m (457 lb·ft) at 1,600 rpm
642.850 (DE 30 LA EU6 SCR)2,987 cc 83 × 92 mm 16.5155 kW (208 hp; 211 PS) at 3,400 rpm540 N·m (398 lb·ft) at 1,600 rpm
642.852 (EU5)2,987 cc 83 × 92 mm 15.5170 kW (228 hp; 231 PS) at 3,800 rpm540 N·m (398 lb·ft) at 1,600 rpm
642.852 (DE 30 LS EU5)2,987 cc 83 × 92 mm 15.5195 kW (261 hp; 265 PS) at 3,800 rpm620 N·m (457 lb·ft) at 1,600 rpm
642.852 (D 30 LS red. SCR)2,987 cc 83 × 92 mm 15.5170 kW (228 hp; 231 PS) at 3,800 rpm540 N·m (398 lb·ft) at 1,600 rpm
642.852 (D 30 LS EU6 SCR)2,987 cc 83 × 92 mm 15.5185 kW (248 hp; 252 PS) at 3,600 rpm620 N·m (457 lb·ft) at 1,600 rpm
642.8532,987 cc 83 × 92 mm 15.5195 kW (261 hp; 265 PS) at 3,800 rpm620 N·m (457 lb·ft) at 1,600 rpm
642.8542,987 cc 83 × 92 mm 15.5195 kW (261 hp; 265 PS) at 3,800 rpm620 N·m (457 lb·ft) at 1,600 rpm
642.8552,987 cc 83 × 92 mm 15.5190 kW (255 hp; 258 PS) at 3,400 rpm620 N·m (457 lb·ft) at 1,600 rpm
642.8562,987 cc 83 × 92 mm 15.5170 kW (228 hp; 231 PS) at 3,800 rpm540 N·m (398 lb·ft) at 1,600 rpm
642.858 (DE 30 LS)2,987 cc 83 × 92 mm 15.5195 kW (261 hp; 265 PS) at 3,800 rpm620 N·m (457 lb·ft) at 1,600 rpm
642.858 (D 30 LS EU6 SCR)2,987 cc 83 × 92 mm 15.5185 kW (248 hp; 252 PS) at 3,600 rpm620 N·m (457 lb·ft) at 1,600 rpm
642.8622,987 cc 83 × 92 mm 15.5190 kW (255 hp; 258 PS) at 3,600 rpm620 N·m (457 lb·ft) at 1,600 rpm
642.8682,987 cc 83 × 92 mm 15.5190 kW (255 hp; 258 PS) at 3,600 rpm620 N·m (457 lb·ft) at 1,600 rpm
642.8702,987 cc 83 × 92 mm 16.5155 kW (208 hp; 211 PS) at 3,400 rpm540 N·m (398 lb·ft) at 1,600 rpm
642.872 (DE 30 LA LR)2,987 cc 83 × 92 mm 15.5140 kW (188 hp; 190 PS) at 3,800 rpm440 N·m (325 lb·ft) at 1,400 rpm
642.872 (D 30 LS)2,987 cc 83 × 92 mm 15.5195 kW (261 hp; 265 PS) at 3,800 rpm620 N·m (457 lb·ft) at 1,600 rpm
642.8732,987 cc 83 × 92 mm 15.5190 kW (255 hp; 258 PS) at 3,400 rpm620 N·m (457 lb·ft) at 1,600 rpm
642.8862,987 cc 83 × 92 mm 17.7155 kW (208 hp; 211 PS) at 3,800 rpm540 N·m (398 lb·ft) at 1,600 rpm
642.8892,987 cc 83 × 92 mm 15.5190 kW (255 hp; 258 PS) at 3,400 rpm550 N·m (406 lb·ft) at 1,400 rpm
642.8902,987 cc 83 × 92 mm 17.7165 kW (221 hp; 224 PS) at 3,800 rpm440 N·m (325 lb·ft) at 1,400 rpm
642.9102,987 cc 83 × 92 mm 17.7165 kW (221 hp; 224 PS) at 3,800 rpm510 N·m (376 lb·ft) at 1,600 rpm
642.920 (DE 30 LA LR)2,987 cc 83 × 92 mm 17.7140 kW (188 hp; 190 PS) at 4,000 rpm440 N·m (325 lb·ft) at 1,400 rpm
642.920 (DE 30 LA)2,987 cc 83 × 92 mm 17.7165 kW (221 hp; 224 PS) at 3,800 rpm510 N·m (376 lb·ft) at 1,600 rpm
642.920 (DE 30 LA)2,987 cc 83 × 92 mm 17.7165 kW (221 hp; 224 PS) at 3,800 rpm540 N·m (398 lb·ft) at 1,600 rpm
642.921 (DE 30 LA LR)2,987 cc 83 × 92 mm 17.7140 kW (188 hp; 190 PS) at 3,800 rpm440 N·m (325 lb·ft) at 1,400 rpm
642.921 (DE 30 LA)2,987 cc 83 × 92 mm 17.7165 kW (221 hp; 224 PS) at 3,800 rpm510 N·m (376 lb·ft) at 1,600 rpm
642.9302,987 cc 83 × 92 mm 17.7173 kW (232 hp; 235 PS) at 3,600 rpm540 N·m (398 lb·ft) at 1,600 rpm
642.9312,987 cc 83 × 92 mm 17.7173 kW (232 hp; 235 PS) at 3,600 rpm540 N·m (398 lb·ft) at 1,600 rpm
642.9322,987 cc 83 × 92 mm 17.7173 kW (232 hp; 235 PS) at 3,600 rpm540 N·m (398 lb·ft) at 1,600 rpm
642.940 (DE 30 LA LR)2,987 cc 83 × 92 mm 18140 kW (187 hp; 190 PS) at 4,000 rpm440 N·m (325 lb·ft) at 1,400 rpm
642.940 (DE 30 LA)2,987 cc 83 × 92 mm 18165 kW (221 hp; 224 PS) at 3,800 rpm510 N·m (376 lb·ft) at 1,600 rpm
642.940 (DE 30 LA)2,987 cc 83 × 92 mm —155 kW (208 hp; 211 PS) at 3,400 rpm540 N·m (398 lb·ft) at 1,600 rpm
642.950 (DE 30 LA LR)2,987 cc 83 × 92 mm 17.7140 kW (187 hp; 190 PS) at 4,000 rpm440 N·m (325 lb·ft) at 1,400 rpm
642.950 (DE 30 LA)2,987 cc 83 × 92 mm 17.7165 kW (221 hp; 224 PS) at 3,800 rpm510 N·m (376 lb·ft) at 1,600 rpm
642.9602,987 cc 83 × 92 mm 17.7165 kW (221 hp; 224 PS) at 3,800 rpm510 N·m (376 lb·ft) at 1,600 rpm
642.9612,987 cc 83 × 92 mm 17.7165 kW (221 hp; 224 PS) at 3,800 rpm510 N·m (376 lb·ft) at 1,600 rpm
642.9702,987 cc 83 × 92 mm 17.7165 kW (221 hp; 224 PS) at 3,800 rpm540 N·m (398 lb·ft) at 1,600 rpm
642.9902,987 cc 83 × 92 mm 17.7150 kW (201 hp; 204 PS) at 3,800 rpm440 N·m (325 lb·ft) at 1,600 rpm

Applications.

Every model powered by the OM642.

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