Warranty for deisel engines - beware. - Mercedes-Benz Forum

LinkBack Thread Tools Display Modes
post #1 of 3 (permalink) Old 07-31-2011, 08:47 AM Thread Starter
BenzWorld Junior Member
Date registered: Oct 2009
Vehicle: 2009 R-320 Bluetec
Location: Chicago
Posts: 16
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
(Thread Starter)
Unhappy Warranty for deisel engines - beware.

On all Mercedes diesel vehicles (inc the Sprinter) the warranty states "use only diesel fuel with a maximum of 5 ppm sulfur content". This fuel is called B5.
Here in Illinois (Chicago area) all the gas stations have switched to selling a bio-diesel with a 15 max ppm content, this fuel is called a B20. This change over was caused by the price factor, the tax rebate involved with selling a fuel with a higher bio content (up to 20%).
This fuel voids the warranty on all Mercedes, BMW and Audi diesel engines.

Needless to say my car purrs like a pussy cat with this fuel and gets great MPG.

MBUSA is giving me the 'great run around' and all they do is read me the warranty, are not willing to recommend any technical adjustments to protect the engine with this B20 fuel.

Any suggestions would be helpful.


Last edited by andyamit; 07-31-2011 at 08:52 AM. Reason: make bold
andyamit is offline  
Sponsored Links
post #2 of 3 (permalink) Old 07-31-2011, 10:36 AM
BenzWorld Member
Iridium's Avatar
Date registered: May 2009
Vehicle: 1984 300D Turbo
Posts: 243
Mentioned: 0 Post(s)
Quoted: 4 Post(s)
You are confusing two different things.

All diesel fuel sold in the US today is Ultra Low Sulfur Diesel (ULSD) and has a maximum sulfur content of 15 ppm (parts per million).

B5 refers to the percentage of biodiesel content in a diesel blend. In this case, 5% biodiesel, 95% dino diesel.

Since biodiesel has virtually no sulfur in it, adding more biodiesel to the mix (as in B20) lowers the overall sulfur content in the fuel. Sulfur is therefore not the issue.

However, it is true that Mercedes Benz USA recommends and warrantees the engine only for a maximum of B5 biodiesel. There are good reasons for that. For example, higher levels of biodiesel can cause oil dilution in late-model vehicles that use post-injection as part of the pollution control system.

You may be caught between a rock and hard place if you really can't buy B5 or straight dino diesel in the Chicago area, but look around -- you'll probably find that lower blends than B20 are available.
Iridium is offline  
post #3 of 3 (permalink) Old 07-31-2011, 11:14 AM Thread Starter
BenzWorld Junior Member
Date registered: Oct 2009
Vehicle: 2009 R-320 Bluetec
Location: Chicago
Posts: 16
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
(Thread Starter)
thanks for the link.
When I first bought the car, on all the pumps it was specified 5ppm sulfur, now on all of them it says 15ppm with a bio diesel content of 20% max. (B20)
I noted the sulfur content because that is the most obvious displayed signage on the pumps, they seem to go hand in hand. 5ppm= B5 and 15ppm=B20
There is even a further disclaimer on the pumps stating that this fuel might void manufacturers warranty.
That is now the ONLY diesel fuel available within a 25 mile radius of Chicago.
andyamit is offline  
Sponsored Links

  Mercedes-Benz Forum > General Mercedes-Benz Forums > General Mercedes-Benz

Quick Reply

Register Now

In order to be able to post messages on the Mercedes-Benz Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


  • Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
    Thread Tools
    Show Printable Version Show Printable Version
    Email this Page Email this Page
    Display Modes
    Linear Mode Linear Mode

    Similar Threads
    Topic Author Forum Replies Last Post
    Cam Differences between NA engines and Turbo Engines tmodler Unimog 23 03-25-2011 08:26 PM
    Extended Warranty Expiring - Beware of... benzgirl14 C209/A209 CLK-Class 2 08-26-2009 04:18 AM
    WTT: 2003 Z4 2.5i Sport Warranty *56k Beware* SLKRoadster99 For Sale/Wanted/Trade/Giveaway 1 03-12-2008 07:03 PM
    OT Q: Are diesel engines more reliable than gasoline engines, and if so why? Thnx. Cap R170 SLK-Class 2 11-13-2002 05:44 AM
    Is deisel to turbo deisel conversion easy? Guest (MBNZ) W123 E,CE,D,CD,TD,TE Class 2 06-11-2002 01:20 AM

    Posting Rules  
    You may post new threads
    You may post replies
    You may not post attachments
    You may not edit your posts

    BB code is On
    Smilies are On
    [IMG] code is On
    HTML code is Off
    Trackbacks are On
    Pingbacks are On
    Refbacks are On


    Title goes here

    video goes here
    description goes here. Read Full Story
    For the best viewing experience please update your browser to Google Chrome