Cat C-15 fuel question

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Largecar359, May 15, 2021.

  1. Largecar359

    Largecar359 Road Train Member

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    I recently updated one of my 359’s with a C-15 motor. I removed the original 3406b, and replaced it with a C-15 6NZ. In my B motor I always ran lubricant in the fuel to compensate for the lost lubricant in today’s fuel compared to the fuel refined back in 1985. Is this something I should continue to do with the newer style motor? I was planning on only using a fraction of what I used to put in the fuel, does this seem correct? I understand fuel supplements are a controversial issue, with that being said, the 3406b turned a hair over 3 million miles before coming out. Is the C-15 a motor that likes a small amount of lubricant for injectors?
     
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  3. lester

    lester Road Train Member

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    I think everything can benefit from a little additive. This fuel is so dry, adding some lubrication is good.

    My john deere dealer strongly recommends all its customers to run something in all their equipment
     
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  4. Largecar359

    Largecar359 Road Train Member

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    Well that is my thinking, diesel fuel today is far too dry and almost evaporates when rubbing it with your fingers. I remember when you would have to watch your step on the fuel rack bc if you got diesel on your shoes it was a major hassle to get it off. Don’t seem to have that issue anymore.
    I just wanted to ask some guys/gals that have the C-15 what they have been doing.
     
  5. 062

    062 Road Train Member

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    I have a E-model and dump a gallon of two stroke to 300 gal when I can remember to do it. I wouldn’t try it with these new motors and the stupid high fuel psi.
     
  6. rollin coal

    rollin coal Road Train Member

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    Count me in the skeptical category. I never ran any fuel additives through the MBN C-15 my other truck had. The odometer showed over 1,500,000 miles when I got rid of it and more half of them were mine. No fuel related problems ever.
     
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