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5R55 oil analysis info from Blackstone labs-

Discussion in 'Stock 2002 - 2005 Explorers' started by hertfordnc, March 14, 2019.

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    1. hertfordnc

      hertfordnc Member

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      Location:
      Eastern NC
      City, State:
      Hertford, NC
      Year, Model & Trim Level:
      2004 XLT 4.6 xlt
      My 2004 XLT has 187,000 miles, probably has original ATF.

      So I wanted to know if a fluid analysis would be useful in guessing how much life might be left in it.

      I wrote to Blacksone labs and got this excelent response.


      Hi Dave,

      We would of course be able to quantify our findings if you sent in a
      transmission sample to us. The tricky bit is, though, that it's still the
      factory fill ATF, which means metals will likely be on the high side from
      lingering break-in left over from when the transmission was new, plus
      normal accumulation over the past 190,000 miles. That can make it difficult
      for us to say if your transmission does indeed have a problem, though if a
      bushing has failed, we might expect copper (rather than aluminum) to read
      even higher than we'd expect for break-in.

      Since the transmission is running fine for you, our suggestion would be to
      change out the factory fill, and then sample the next fill after about
      30,000 miles or so to see how things look. We do indeed have a good
      baseline established for these 5R55S transmissions, and that suggested
      30,000 miles is about the average change interval for them.

      Sincerely,

      Clair Pranger
      Blackstone Laboratories
      416 E. Pettit Ave.
      Fort Wayne, IN 46806
      (260) 744-2380
       
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    3. Blue m&m

      Blue m&m Elite Explorer

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      92 Eddie 4x4
      Dear lord. How have you gotten that kind of mileage on the original fluid?
       
    4. hertfordnc

      hertfordnc Member

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      Location:
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      2004 XLT 4.6 xlt
      I don't know for sure but we bought it around 100K and put another 90,000 on it. maybe it got flushed every 30K, maybe it failed and was replaced. But I'm assuming nothing was ever done.
       
    5. ROBinGa

      ROBinGa Active Member

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      My 2003 4.6 4x4 has 177k miles on the original trans fluid and filter. I bought a new filter couple years ago and an adapter for the fill plug, but am taking that “if it ain’t broke don’t fix it” approach at this point. It’s been fine - knocks wood- so I don’t want to risk any changes.
       
    6. Albino 94LTD

      Albino 94LTD Recovering from Moab 2016 Elite Explorer

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      Blackstone is a top notch company. They don't just send the report, they include their interpretation of the numbers..

      Great company.

      Send in motor oil samples too
       
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    7. Number4

      Number4 "I'm counting to 3, then I'm getting your dad." Elite Explorer

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      04 Ford Explorer 4.6l
      220k on my 2004 4.6l 5R55S. All original.

      Only got 99k on my 4.0l 5R55S.

      Too afraid to do any fluid changes.
       
    8. hertfordnc

      hertfordnc Member

      Joined:
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      Location:
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      Year, Model & Trim Level:
      2004 XLT 4.6 xlt
      If this was just me daily driver i would not worry about it but i want this truck for road trips and excursions deep in the woods. I want to know the trans has some years left in it.

      Oil analysis is only $25 and they can tell you a lot of stuff. Apparently, the failure point for these trannnies is the servo bushings. The amount of aluminum and copper in the oil will provide a good indication as toe how worn they are.
       

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