Mercedes-Benz OM648 engine

{{Infobox automobile engine

| name = Mercedes-Benz OM648

| image = OM646.JPG

| manufacturer = Mercedes-Benz

| production = 2002-2006

| predecessor = OM613

| successor = OM642

| configuration = Inline 6

| displacement = {{convert|3222|cc|L|1|order=flip|abbr=on}}

| bore = {{convert|88|mm|2|abbr=on}}

| stroke = {{convert|88.3|mm|2|abbr=on}} {{cite web |url=http://www.greencarcongress.com/2016/02/20160215-mbenz.html |title=Mercedes-Benz introducing new diesel family in E 220 d this spring; new OM 654 with 13% lower fuel consumption; diesel "indispensable" |date=15 February 2016 |website=greencarcongress.com |publisher=greencarcongress.com |access-date=2016-04-20 |quote= |archive-url=https://web.archive.org/web/20160216093002/http://www.greencarcongress.com/2016/02/20160215-mbenz.html |archive-date=2016-02-16 }}

| block = Cast iron

| head = Aluminum

| valvetrain = DOHC 4 valves x cyl.

| compression =

| turbocharger = Single variable nozzle

| fuelsystem = common rail fuel injection

| management =

| fueltype = Diesel

| oilsystem = Wet sump

| coolingsystem = Water cooled

| power = {{convert|204|PS|kW hp|0|abbr=on}}

| specpower = {{convert|{{#expr:204/3.222 round 1}}|PS|kW hp|1|abbr=on}} per litre

| torque = {{convert|500|Nm|lbft|0|abbr=on}}

| length =

| width =

| height =

| diameter =

| weight =

}}

The Mercedes-Benz OM648 engine is a 3.2 Litre, straight-6 4 valves per cylinder, cast iron block diesel engine manufactured by the Mercedes-Benz division of Daimler AG as a replacement for the previous Mercedes-Benz inline-5 and -6 engines.

The engine features common rail fuel injection and a variable nozzle turbocharger. The injection system operates at {{convert|1600|bar|psi|abbr=on}}.

Power output is {{convert|204|PS|kW hp|0|abbr=on}} at 4200 rpm and {{convert|500|Nm|lbft|0|abbr=on}} of torque from 1,800 to 2,600 rpm.

Mercedes claims this engine will propel the E320 CDI to {{convert|60|mph|abbr=on}} in 6.6 seconds. All while managing {{convert|27|mpgus|abbr=on}}+ city and {{convert|37|mpgus|abbr=on}}+ Highway{{Citation needed|date=October 2009}}

Oil specification MB 229.31 or MB 228.31 is recommended and has a service interval of {{convert|13000|mi}} using the specified oil.{{Citation needed|date=October 2009}}

OM648 is the successor to the OM613.