S203 C220 CDI Economy

Discussion in 'Engine' started by lancebond, Jul 18, 2011.

  1. lancebond

    lancebond Hardcore MB Enthusiast

    Messages:
    431
    Joined:
    Jul 17, 2010
    Location:
    Newcastle
    Car:
    S203 C220 CDI
    i've been getting around 43-45 mpg on a tank, and all of a sudden i'm now getting around 37!

    i always thought the 45 was a bit low (i took into account the fact it's an auto, but even so with my previous w203 manual i was getting close to 60mpg) but now i'm worried that i can't crack 38...


    it's a little overdue for it's B service, is there anything else i should be looking for other than the filters that are due to be checked/replaced
     
  2. avantgardeauto

    avantgardeauto Member

    Messages:
    51
    Joined:
    Jul 23, 2010
    Location:
    Bristol
    Car:
    Mercedes-Benz C320CDI & SLR McLaren Coupe
    I would say a good service may sort it out.

    Also what is you engine temperature doing? Make sure its running around 80-90 degrees and not taking an age to get there, a jammed thermostat can cause poor economy.
     
  3. recardo

    recardo Active Member

    Messages:
    65
    Joined:
    Aug 15, 2005
    Location:
    Ayrshire
    MAF could be another cause. Not sure if there is a defined test to confirm it though.
     
  4. OP
    OP
    lancebond

    lancebond Hardcore MB Enthusiast

    Messages:
    431
    Joined:
    Jul 17, 2010
    Location:
    Newcastle
    Car:
    S203 C220 CDI
    i'm going to give it a good service. the maf seems fine.

    so i need

    air filter
    fuel filter
    oil filter

    oil (mobil 1 i know, but what oil exactly do i need?)


    am i missing anything that needs to be changed?
     
  5. recardo

    recardo Active Member

    Messages:
    65
    Joined:
    Aug 15, 2005
    Location:
    Ayrshire
    have you done the service? any improvement?
     
  6. OP
    OP
    lancebond

    lancebond Hardcore MB Enthusiast

    Messages:
    431
    Joined:
    Jul 17, 2010
    Location:
    Newcastle
    Car:
    S203 C220 CDI
    Changed the air filter and was an improvement, just waiting on some decent weather to change the oil and fuel filters
     

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