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12 years old coolant and 5K miles?

Discussion in '5.0L Coyote V8 Engine Modification/Discussion' started by ldc1955, Jan 3, 2020.

  1. ldc1955

    ldc1955 Member Established Member

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    Oct 13, 2015
    Location:
    Madison WI
    Hoping to hear any guidance or experience others may have on this one. I have a bead on a 12 years old very low mileage (about 5K) Mustang GT 4.6L. It’s some distance from me so I am working from photos and other records. It appears the owner has not changed the coolant since new, despite the six year replacement interval specified in the maintenance schedule. How damaging is this “deferred maintenance” likely to be? Minor concern, change soon as one can? A reliability nightmare that will cause endless problems? Would appreciate any light you folks might shed on this one. I know it’s not a S550 but it’s an all aluminum engine and this forum is much more active than the S197 forum, so hoping to generate some helpful direction. Thanks.
     
  2. me32

    me32 BEASTLY SHELBY GT500 TVS Moderator

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    Location:
    CA,NorCal
    If you are seriously interested in this car. I would pay a ford dealer in the local area where where the car is to be completely checked out top to bottom with a full report from the dealership.
     
  3. ldc1955

    ldc1955 Member Established Member

    Messages:
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    Joined:
    Oct 13, 2015
    Location:
    Madison WI
    Thanks for suggesting this. Appreciate any other input from forum members who have experience or perspectives on low mileage cars with original, overdue coolant inside.
     
  4. scotmach

    scotmach Well-Known Member Established Member

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    Location:
    Connecticut
    You'd have more luck with responses if this were posted in the correct forum. You are asking about a 4.6 in the 2015+ 5.0 section.
     

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