2003 Mercedes-Benz S500 4MATIC Questions

All 2003 Mercedes-Benz S500 4MATIC Questions

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At oil change, what type and viscosity should be used?
lights, music, horn and heat works but it wont start
it wont turn on or crank over but everything works
when i start blower then compressor is on.and ac switch(on off)is off.what reasons.pls help me.
Recently I reloaded my CD changer which is housed in the trunk and when I turned on the audio device, it did not recognize the CD Changer. What are my options to this dilemma?
The manual indicates to remove the screw securing the battery and remove the battery support and bracket. Where are these two items located as there is no apparent screw / bracket on the top side of the battery. How...
the car won't start some times, the code showed bad CPS