Need to change the engine oil of your Mercedes-Benz OM651 2.1L Diesel Engine? By following the procedures below, learn how to replace your Mercedes-Benz engine oil and oil filter. The video and pictures are from a 2014 GLK250 BlueTec, but the procedure applies to other Mercedes-Benz models equipped with the OM651 engine.
What you will need
You will need a list of tools and parts to replace the engine oil on your Mercedes-Benz Engine OM651.
Parts
- Engine Oil SAE 0W-40
- Capacity: 5.9 US qt (5.6 l)
- Specification: MB 229.5
- 1 quart (US) = 0.9463 liter
- Engine Oil Filter
- See part numbers below.
Tools
- Oil Filter Wrench or Oil Filter Pliers
- Oil drain pan
- Oil Funnel
- Work Gloves
- Ramps or Floor Jack
- Jack stands (x2)
- Ratchet
- Metric Sockets
- Wheel Chocks
- Torque Wrench
Procedure
- Jack up the vehicle. Drive the vehicle on ramps, use the floor jack, and place the transmission in Park.
Then turn the ignition off and remove the key from the ignition.
Then turn the ignition off and remove the key from the ignition.
Secure the vehicle with jack stands. The jack stands must support the vehicle frame. Do not place a jack stand under the engine or suspension components. 
Place wheel chocks behind the rear tires to prevent the vehicle from rolling, or you can also use a block if there are no available wheel chocks. Ensure parking brakes are engaged. 
Allow for the engine to cool down for at least fifteen minutes. If the engine is already cool, you can already continue to the next step.
Remove the splash shield from under the engine. To remove the splash shield, you need a ratchet and socket to remove the 8mm eight bolts around it.
In some models, you have a combination of screws and plastic retainers. Please remove all of them to drop the cover and access the oil drain bolt. 
Slide an oil drain pan and place it under the oil bolt. Check if the oil pan can capture all of the engine oil. 
Use a 13mm wrench to remove the oil drain plug. 
Loosen the oil drain bolt by turning it counterclockwise. If removing the oil drain bolt is extremely difficult, you need to check that you are not turning the bolt in the wrong direction.
Drain engine oil. Be careful if the engine is still hot because the engine oil will also be hot, and it can cause burns if it comes in contact with your skin.
Carefully remove the oil drain plug and let the engine oil drain for several minutes.
Replace copper washer. It is recommended to replace the copper washer every time you change the engine oil. Do not reinstall the drain plug without a copper washer.
Install Drain Plug. Initially, screw it by hand to avoid cross-threading. Use a torque wrench to tighten the drain plug to specification, and do not use a breaker bar to tighten the drain plug. See recommended torque at the end of this guide.
Locate the engine oil filter and replace it. Use an oil wrench to remove the oil filter cartridge and keep an oil drain pan near the oil filter, as oil may drip from the oil filter when you remove the oil filter cartridge. Pull the old filter out when removing the oil filter cartridge and put the new one in. Replace the o-rings on the filter cartridge as well.
Put the engine oil filter back and use the oil wrench to seal it properly—torque to 25Nm.
Open the cover of the engine oil cap and add engine oil.
Use a funnel to pour the engine oil and prevent it from spilling.
Check engine oil level. If you had the engine running or just added oil to the engine, you should wait at least five minutes to take the subsequent measurement. This will allow the engine oil to return to the oil pan so that you can take an accurate measurement. If the level is low, add one quart at a time, wait a few minutes, and recheck the engine oil level. 
Reset the oil service reminder on the instrument cluster.
Inspect the engine for oil leaks from the drain plug and oil filter.
Torque Specifications
- Oil filter: 25Nm
- Oil drain plug: 30 Nm or 23ft-lbs
One newton meter is equal to 0.7376 ft-lbs, rounded to 4 decimal places. To convert newton meters to foot-pounds, multiply your figure by 0.7376.
Applicable Oil Filters
- Fram CH11277 replacement filters
- Beck/Arnley 041-0867
- CARQUEST 94026
- CHAMP P1013
- CHRYSLER 68091826AA
- CHRYSLER 68091827AA
- FIAT K68091826AA
- FIAT K68091827AA
- Fleetguard LF4000
- HASTINGS LF723
- HENGST E11HD204
- JURA SO7217
- KNECHT OX153-7D2ECO
- Land Rover LR022896
- LUBER-FINER P1013
- MAHLE OX153-7D2
- MAHLE OX153-7D2ECO
- MANN & HUMMEL HU7010z
- MANN & HUMMEL HU718-4Y
- MERCEDES-BENZ 1121840425
- MERCEDES-BENZ 6511080009
- MERCEDES-BENZ 6511800109
- MERCEDES-BENZ 6511800309
- MERCEDES-BENZ 6511840025
- NAPA 100026
- Nissan 15209-HG00A
- PUREPRO PL91013
- Purolator L21405
- ROVER LR022896
- SERVICE CHAMP WP1013
- STP S11277
- WARNER WP1013
- Wix WL10026
- Wix WL7470
We hope you find the Mercedes-Benz OM651 2.1L Diesel Engine Oil Change DIY guide helpful. Check these troubleshooting and repair guides for more help on your Mercedes-Benz.