Driving in town

Discussion in 'Grand Cherokee Diesel Discussions' started by Bruce Sherwood, Apr 7, 2014.

  1. Bruce Sherwood

    Bruce Sherwood New Member

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    I had a rude awakening today, and I wonder what others make of this. We've had a GC Overland with diesel for a few months, with 2500 miles on it. This weekend I got warning messages that I needed an oil change, which made no sense, since all the information said that an oil change is called for every 10000 miles, at which time the Diesel Exhaust Fluid (DEF) would also have to be replaced (at high cost, but we judged that would be okay if it's needed only every 10000 miles). Then I got an ominous message that stayed on the screen at all time saying "Exhaust Filter Near Full, Safely Drive at Highway Speeds to Remedy".

    At the dealer a very knowledgeable certified technician explained to me that the problem is that we had been making lots of short trips in town, idling at red lights, with the result that the oil viscosity was now out of spec and that the particulate exhaust filter was nearly full and needed an hour of 75 mph driving to get the temperature high enough to burn off the accumulated particulates. No person and no manual had ever ever mentioned that there is a big problem associated with city driving. Normally we would be doing some highway driving regularly, but in recent weeks we've been very busy at home on a major computer project.

    This has made us seriously reconsider our purchase, as we thought we were buying a vehicle that was multipurpose, and we wouldn't need to own two vehicles. We feel like we were misled. Moreover, we've not been given any real guidance as to how much highway driving we have to do to maintain the car in good shape. In fact, though the technician told us that we need to drive at 75 mph for an hour, on the way home the message changed to something like "Now regenerating..." and after 15 minutes of 45 mph driving the message changed to "Regeneration completed."

    We had to have an oil change (no charge because we had bought the oil change package with the car) but I had to pay $80 for topping up the DEF. We're not happy campers.

    Bruce
     
  2. Casper

    Casper Moderator

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    Oil and DEF use are approximated by miles, hours would be more realistic.

    30 min at 60 should have taken care of that re-gen problem...... my vehicle has 1500 miles on it and tells me oil is at 85% ......at 8 bucks (at the most) a gallon 8.5 gal = 68 bucks. I have used about a gal every 500 miles which I contribute to City driving and a lot of idling. That should change when I hit the road this summer. But the DEF fill is next to the diesel fill which makes me tend to believe that topping of the def is done at the gas station and not the dealer. There are other aspects of this vehicle which in my opinion takes it of the table as a drive and forget....Such as valves to bleed and warming up times and cooling down. The first article I read said they were targeting people who tow.....I do believe you were mislead.....There were attempts by dealers to lead me away from the diesel.... but I believe that I have the right tool for the job.
     
  3. Bruce Sherwood

    Bruce Sherwood New Member

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    "Valves to bleed"??? What's that?

    "Warming up times"?? Also, what's that? As I reported in this forum, I did find buried in the diesel supplement manual the instructions to idle for a while before shutting down, but I've not seen anything about warming up.
     
  4. Casper

    Casper Moderator

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    Draining Fuel/Water Separator Filter
    The fuel filter/water separator housing is located on the
    left side of the vehicle in front of the fuel tank. The best
    access to this water drain valve is from under the vehicle.

    Valves to bleed was not accurate..... Filter to drain.... Glow plugs warm it up... it's that hesitation between pushing the button and it starting.... but I try to idle a minute or so before putting it in gear. And a minute or so after taking it out. More before in cold weather and more after in warm. I think for a retired person it would serve well as a only car. And when I retire I am getting rid of the Prius.... until then it's good for dodging shopping carts and getting to work.
     
  5. granite

    granite Member

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    I must say you were taken to the cleaners with the topping off the the DEF. If it were empty and needed a full fill of DEF which obviously wasn't the case as you drove it into the dealer, you would have needed 8.0 gallons of the stuff which meant buying 4 - 2.5 gallon containers at $11.97 + tax each and still have 2 gallons left over for topping off in the future.
    BLUE DEF Diesel Exhaust Fluid - Walmart.com
     
  6. Bruce Sherwood

    Bruce Sherwood New Member

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    I've poked around under the car looking for the Fuel/Water Separator Filter, without success. Can someone give me more detailed instructions than "left side of the vehicle in front of the fuel tank"? Also, what sort of tool is required to open the drain? From the photo in the diesel manual it looks like it needs a Philips-head screwdriver -- is that correct?
     
  7. Casper

    Casper Moderator

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    I have not laid eyes on them myself.... but from what I gather you would need remove the transmission skid plate to access the filters.... then I believe the diagram is showing cover plates. Looks like the water separator filter has a petcock that can be opened with fingers or pliers if stiff. I saw it in the manual and goggled as much info as I could. Maintenance frequency is low...... but me.... I like to do things myself.
    Once again..... Every thing I enter on this forum is subject to scrutiny. I an not a mechanic nor am I pretending to be one.
     
  8. emersonjeep

    emersonjeep New Member

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    I recall the owners manual showing a service interval for bleeding the water and changing the filter-- something even less frequent than oil changes, so I plan to have this done by the dealer at the time of an oil change that is nearing that service interval. Do those of you with more diesel experience think this should be done more often?
     
  9. Casper

    Casper Moderator

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    I regret having even brought up the topic. If one were using the dealer for oil changes then fuel filters would defiantly be a dealer thing. As far as frequency.... I do tend to over do things.
     
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