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Mercedes Benz M-Class ML320 CDI



  • dyoung46dyoung46 Posts: 2
    Live in Hi Desert where temps drop to low teens & single digits, read recently that low sulfur diesel fuel can "gel" at low temps, wondering if a) anyone has experienced something like this b) availability of this low sulfur diesel fuel, Plenty of Chevron stations here, do they carry it??
    thanks to all
  • gagricegagrice San DiegoPosts: 31,178
    ULSD is number 2 diesel. It is good down to about zero. Most cold areas blend in number 1 diesel (kerosene) when it is very cold to prevent gelling. 100% Biodiesel can gel at a much higher temp. It depends on the source. I would mix it with number 2 diesel anytime you are in the freezing range. Most all stations are required to sell ULSD or post if they do not have it. To be sure you can use additives that prevent gelling.

    Welcome to the Forum
  • cneffcneff Posts: 65
    Just picked up an 07 ML320CDI and noticed an occasional sulfer smell and it stung my eyes....this happened at traffic lights and while idling in my driveway. Not brutal but enough to notice. What is odd is that the demo I drove showed no signs of this - I even stood behind it while it was running just to make sure. Mine is brand new, 42 miles on it.
    MB Customer service said that should not be, as the person I spoke to had the same model, maybe the dealer made an error and filled the tank with the wrong type of diesel.

    Anyway...have any of you noticed this with the new CDIs? Does it improve over time?

    I'm going to service just to be sure. Otherwise I am impressed with the drive ability of these Diesels. Over 20mpg on the computer and it is not nearly broken in yet.

    Thanks in advance
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  • subdensubden Posts: 40
    I have about 1000 miles on mine and have never even had a whiff of diesel fumes even when idling for long periods at cold temps (I live in Boulder, CO).I suspect that you may have a fuel issue.

    So far, like you, I'm impressed with the driveability, particulary at altitude.
  • mschafermschafer Posts: 317
    You are not allowed any additives with the 2007+ MB diesels.
  • mschafermschafer Posts: 317
    4000+ miles on mine and no sulfur smell on mine either. Sounds like your dealer may have done your initial fill with LSD and not ULSD.

    Best get that on record with MBUSA, as they very specifically state that the use of non-ULSD will result in no warranty coverage. Too much sulfur hurts the particle filter, and that puppy is about $3,000.
  • cneffcneff Posts: 65
    Thanks everyone for the feedback - it makes sense. I also think there is a fuel problem and I have noted it with the dealer and MBUSA. I'll be taking the ML in ASAP...they are expecting me.

    I do hope it is just the fuel as I am most impressed with the mileage (still on that first tank from the dealer) this ML is capable of...not to mention the gobs of torque right under ones right foot.
  • parockerparocker Posts: 2
    I ordered my ML 320 CDI about 7 weeks ago and am eager for its arrival. I have always gone for reliability when buying cars (TOYOTA AND LEXUS MOSTLY) and was disturbed to read the most recent issue of Consumer Reports which rated Mercedes at the BOTTOM of the list, even lower than Range Rover for crying-out-loud, in reliability. I am interested in your experiences with the M Class and Mercedes in general as Consumer Reports seems to consistently give MB and F. I buy new and keep forever and I though what better vehicle than a Mercedes Diesel (who know diesel better).
  • mercaramercara Posts: 291
    I have been monitoring the message boards about the reliability of Mercedes as I am interested in buying a GL320 CDI. So far it seems to be a mixed bag. Some issues around the airmatic suspension and more recently a hose on the turbo coming off causing the truck to go into limp mode. Otherwise seems fine. It's hard to say for sure if mercedes has improved until after a few model years.
  • mschafermschafer Posts: 317
    I've had mine for just short of 2 months and have about 4300 miles on mine. So far so good. No problems of any kind; and I do have the Airmatic suspension - like it a lot!!.

    I am very pleased with this truck. (Yes, it is considered to be a part of the MB Light Truck family.)

    My only disappointment is that some important options - like the Off Road Pro option - are not available in the USA.
  • ty39ty39 Posts: 23
    I am interested in the diesel engine except for the the times that I will fill the tank! I used to carry a glove in my old diesel SUV, but it didn't take long to have to buy another glove. Is a glove still a necessary 'extra' in the new ML320 CDI or is there a better way?
  • gagricegagrice San DiegoPosts: 31,178
    Most stations in my area supply plastic throw away gloves. Diesel does not evaporate into the atmosphere as gasoline does. It stays on whatever it is slopped onto.
  • mschafermschafer Posts: 317
    The glove is not always necessary; but at some stations the pump handles are indeed a mess. The new ULSD is not as bad as the old LSD, but is still does have a slight odor.

    Buy a box of sterile disposables at your local pharmacy. You'll be just fine.
  • jb_shinjb_shin Posts: 357
    I stepped into a puddle of diesel while in Europe and the smell stayed with me for couple days. I enjoyed driving the car (BMW 525D), but boy I that smell gave me a headache. And Europe has been using low-sulfur diesel.
  • mschafermschafer Posts: 317
    My experience is that the European diesel has less odor than US ULSD.
  • tyresmokertyresmoker Posts: 266
    Finally drove the ML diesel. Other then a little funny looking, what is not to like? Question to owners: What are you seeing- real world mpg??
  • cneffcneff Posts: 65
    I am getting close to 25mpg on average with a mix of city and highway. Hit nearly 28mpg on one highway trip.
  • mschafermschafer Posts: 317
    80 mph interstate driving yields 24.5-25.0 mpg.
  • tyresmokertyresmoker Posts: 266
    That is good news! Mine will be here in 4 weeks..Silver/sport package, P1, nav, heated seats, CD changer and a trailer hitch. With oil on the rise, these vehicles will be impossible to get.
  • billfryebillfrye Posts: 5
    Has anyone heard about the 2-wheel drive (rear drive) 2008 MB ML320 CDI? If so, any word on the fuel economy??


  • nyccarguynyccarguy Stamford, CTPosts: 11,574
    Does anybody know when the ML 320 CDI will be 50 state emission legal (MY 2008?). And when will they be available for ordering?

    2001 Prelude Type SH, 2015 Infiniti Q40 AWD, 2017 Honda Pilot Touring AWD

  • steverstever Posts: 52,683
    You may want to check in the Diesels in the News discussion too.
  • bubbadogbubbadog Posts: 3
    I current have a Jeep CRD Liberty and love it and am looking for either the ML 320 or the new Jeep Grand Cherokee CRD.
    Does anybody know the 3.0 diesel is a CCV (Closed Crake Case Ventilation) engine?
    Does anybody know if the 3.0 diesel has an EGR (Exhaust Gas Recirculation) valve?
    Can someone look in their owner’s manual and see what the severe duty maintenance schedule is for:
    Engine Oil Change
    Air Cleaner Change
    Differentials oil change
    Transfer case oil change
    Fuel Filter Change
  • genew2genew2 Posts: 2
    I have read on other forums that it is difficult and expensive to change out a fuel filter on the CDI. I am familiar with other diesels but not Mercedes. In a cold climate , 0 or below temp, it is not uncommon to see diesel cars and trucks on the side of the road with gelled fuel and the operator changing filters. On most cars and trucks it is easy to change but sounds like the CDI needs to go to the shop. Does Mercedes diesels not have this problem with fuel filters?? Thanks
  • cneffcneff Posts: 65
    Hi Genew2

    I am no export on diesels but I do have an 07 ML320CDI and have driven it in the winter. Never had a problem even with temps 0 and below, starts right up the first time as well. I am also sure it depends on the type of fuel one uses, I stick to name brands. This is my firs diesel and am pleased with the drive-ability. I do notice during winter the exhaust has a different smell, like clorox. Maybe this is the additive fuel stations use during winter to prevent gelling.
  • gagricegagrice San DiegoPosts: 31,178
    Most stations mix number one diesel (kerosene) with number two during the winter. That should not gel down to minus 40 degrees. Biodiesel in the cold could present problems.

    I am glad to hear you are liking your ML320 CDI. I am looking for one that has 7500 miles so I can license it here in CA. My wife insists on Desert silver metallic with Macadamia Leather.
  • genew2genew2 Posts: 2
    Thanks for your reply and information. It is amazing you have no troubles with the cold weather. I run several over the road trucks and we have some troubles and fuel only where we have good fuel. We run both cummins and cat engines. Evidently Mercedes has it figured out. I will be looking closely at the M class diesel.
  • cneffcneff Posts: 65
    Yeah, I'm pleased, so far so good with cold starts (this is my first diesel). That was one of the things I was worried about, hearing about glow plugs and such. But this 320CDI at most, on really cold mornings, takes a second to start, you barely have time to catch the glow plug indicator when the ignition system says go and starts immediately - it has started right up first time each time so far and runs smooth and quickly becomes quiet. Surprises quite a few folks that have diesels. Typical MB, turn the key and let go, the ignition system does the rest. During warmer seasons there is no delay at all that I can detect.

    so far my best mileage on the highway was 29mpg steady - not bad at all for a 5000 pound square. Got 26mpg with a fully loaded cargo area doing 80 plus on a 5hr trip the other month. Impressive. I have almost 7K on it to date.
  • cneffcneff Posts: 65
    I had a 2000 ML320 (not diesel) with a similar color scheme - desert silver and java. Nice combo indeed on both.

    My 07 ML320 CDI is silver with black interior. I liked the black a bit better due to the large expanses of plastic on the dash in this model. The plastic is not of terrible quality but the black just looked higher quality, less like...well...plastic. ;) But I do like this diesel and if all goes well my next SUV will also be a diesel. It just works.
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