W221M278换机油 | Leighsr
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Index

Mercedes-Benz

Model

Chassis

Engine

Transmission

E350

R350

S550

W251

W212

W221

M276

722.9

M278

Thoroughly Change Engine Oil (M278)

Brand: Mercedes-Benz

Model: S550 4Matic

​Chassis: W221

Engine: M278

Transmission: 722.9

Project: Maintenance

Labor: 1 hour

change engine oil

Overview

Replacing engine oil and the filter is routine maintenance every 1 year or 10,000 miles by the Mercedes-Benz maintenance booklet requires. There are two ways to discharge the used oil, extraction, or drain. In the Mercedes-Benz maintenance manual (WIS): For the M278 engine, the used oil is discharged by the extracting unit, in order to improve the work efficiency of the workshop. For the AMG engine M157, the same structure as M278 is required to drain the oil from the oil pan. After comparing the two methods, there can be filled with 8.5 liters of new engine oil as required by the booklet with drain used oil. For extraction of used oil, only 7.5 liters of new engine oil can be filled. I think this is why the M157 engine requires drain used oil from the oil pan. I chose to drain the used oil, even though it will take a little longer.

Parts

Engine Oil: Mobil 1 Synthetic, 0w-40，8.5 liters

Filter: Purflux (A 276 180 00 09) (up to engine serial number 30-021065)

Hengst (A 278 180 00 09) (after engine serial number 30-021065)

Check engine serial number

Crush Washer: 14mm (N 007603 014106)

Tools

Step 1 Left Vehicle

Lift Vehicle with floor jack and jack stands or two-post lift

Substep:

2.1 Jack front vehicle at front central jack point;

2.2 Support vehicle at front side jack points with jack stands;

2.3 Jack rear vehicle at rear central jack point, if w/o rear central jack point, jack at the bottom of differential shell which  fixed at subframe carrier directly;

2.4 Support vehicle at rear side jack points with jack stands.

Step 2  Recording the Maintenance Information to OBD

Connect MB diagnosis unit

Substep:

2.1 Connect the connector of OBD at the vehicle;

2.2 Connect the connector of LAN at the computer;

2.3 Start the XENTRY;

2.4 Confirm the performance of maintenance.

Step 3 Remove Bottom Engine Cover

Remove bottom engine cover to expose the oil pan 

Substep

3.1 Unscrew 8 bolts to remove the 2nd of the bottom cover

Step 4 Drain Out Used Oil

Substep

4.1 Remove the drain plug of the oil pan

Step 5 Open the Engine Hood

No necessary to verticle the engine hood

Substep

5.1 Pull the lever on the left side of the footwell to unlock the engine hood. Engine hood jumps open; lift engine hood slightly if necessary;​

5.2 Raise the handle and open the engine hood. Windshield wiper arms must not be folded forward.

Step 6 Replace the Oil Filter

Substep

6.1 Pull up the dipstick ​to vent the crankcase;

6.2 Remove the right of engine cover;

6.3 Replace the oil filter replace the O ring seal; 

6.4 Install filter with cap (25Nm/18.5Ib-ft).

Parts

Filter: Purflux (A 276 180 00 09) (up to engine no. 30-021065)

           Hengst (A 278 180 00 09) (after engine no. 30-021065)

           Check Engine Serial Number

Tools

Oil Filter Socket: A 103 589 02 09 00                 

Socket 22mm

Drive Click Torque Wrench 1/2"

Step 7 Fill the New Oil

​Substep

7.1 Install drain plug with new crush washer (30Nm，22lb-ft）

7.2 Install the bottom engine cover;

7.3 Fill the new oil;

7.4 Low down the vehicle.

Step 8 Correct Oil Level

Correct oil level while warm engine

Substep:

8.1 Start the engine and warm up the engine until the coolant temperature is at least 80°C, then turn off the engine;

8.2 Correct the oil level at least be in the center between the Min. and Max. marking on the oil dipstick.

The Video of Entire Process

The related operation guides from MB WIS

Additional Word

The repair program is written according to the repairing booklet of Mercedes and the operation by myself. There will definitely be some incorrect or immature. I appreciate it if you might leave a comment of suggestions to improve the above program, in order to benefit the DIY hobby Needs, thank you!

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