How to carry out replacement: Spark Plug R 320 CDI 3.0 4-matic (251.022, 251.122) Mercedes W251
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Change Mercedes W251 R 300 CDI 3.0 (251.021, 251.121, 251.026) Spark Plug yourself – manuals and video tutorials

How to change spark plugs on MERCEDES-BENZ R-Class (W251, V251) – replacement guide

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Download your free tutorial and fix MERCEDES-BENZ R-Class (W251, V251) R 320 CDI 3.0 4-matic (251.125) problems yourself Download for free 716.8 KB Spark Plug for Mercedes W251 Shop now
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When to replace the Spark Plug on your MERCEDES-BENZ R-CLASS
Recommended replacement interval for the part category Spark plug : 4 year / 100000 km
Important!
This replacement procedure can be used for:
MERCEDES-BENZ R-Class (W251, V251) R 500 4-matic (251.075, 251.175) … View more

The steps may slightly vary depending on the car design.

This video shows the replacement procedure of a similar car part on another vehicle

All the parts you need to replace – Spark Plug for R-Class (W251, V251) and other MERCEDES-BENZ models
Alternative products
How to change Spark plug on Mercedes W251 R 320 CDI 3.0 4-matic (251.022, 251.122) – step-by-step instructions for straightforward car repair Spark plug
Tools
Replacement: spark plugs – MERCEDES-BENZ R-CLASS (W251, V251). Tools you need:
High-temperature anti-seize lubricant
Spark plug socket # 16
Ratchet wrench
Torque wrench
Round-nose pliers
Fender cover
Buy tools
Replacement: spark plugs – MERCEDES-BENZ R-CLASS (W251, V251). AUTODOC experts recommend:
  • The replacement procedure is the same for all spark plugs.
  • All work should be done with the engine stopped.
Replacement: spark plugs – MERCEDES-BENZ R-CLASS (W251, V251). Recommended sequence of steps:
  1. Step 1
    Open the hood.
    Step 2
    Use a fender protection cover to prevent damaging paintwork and plastic parts of the car.
    Step 3
    How to change Spark Plug on Mercedes W251 2005 - free PDF and video manuals
    Remove the spark plug wire connectors from the spark plug wells. Use round-nose pliers.
    Replacement: spark plugs – MERCEDES-BENZ R-CLASS (W251, V251). Professionals recommend:
    Be careful to avoid damaging spark plug wires.Remember the sequence of the spark plug wires connectors.
  2. Step 4
    How to replace MERCEDES-BENZ R-Class (W251, V251) R 320 CDI 3.0 4-matic (251.022, 251.122) 2006 Spark Plug - step-by-step manuals and video guides
    Clean dirt, dust and debris from inside the spark plug wells.
  3. Step 5
    Mercedes W251 R 350 CDI 3.0 4-matic (251.023, 251.123) 2007 Spark Plug replacement: free workshop manuals
    Unscrew the spark plugs. Use the spark plug socket #16. Use a ratchet wrench.
  4. Step 6
    Changing Spark Plug on MERCEDES-BENZ R-Class (W251, V251) R 280 CDI 3.0 4-matic (251.020) 2008 by yourself
    Take out the spark plugs.
  5. Step 7
    How to remove MERCEDES-BENZ R-CLASS R 500 4-matic (251.075, 251.175) 2009 Spark Plug - online easy-to-follow instructions
    Apply a thin layer of a special high temperature anti-seize lubricant to the threads of the new spark plugs.
  6. Step 8
    How to replace Spark Plug on MERCEDES-BENZ R-Class (W251, V251) 2010: download PDF manuals and video instructions
    Install the new spark plugs into their mounting seats.
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