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Thread: Synthetic ATF?

  1. #1
    Senior Member dchawk81's Avatar
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    Synthetic ATF?

    Is it worth running synthetic ATF in a 1998 with the 4R100 transmission?

    What are the benefits? Can the change interval be extended the way synthetic oils in the crankcase can?
    2015 Ford F-150 XLT 5.0
    2001 Chevrolet S-10 LS 4.3
    1998 Lincoln Navigator 5.4

  2. #2
    yea the interval can be extended...syn doesnt break down as easy as conventional ATF
    2018 F150 XLT Sport Supercab 2.7
    1968 Ford Thunderbird 2 door Landau 429 Thunderjet V8 1 of 950

    Past: 16 F150 5.0 , 14 F150 5.0, 07 F150 5.4, 03 Ranger 4.0

  3. #3
    Senior Member dchawk81's Avatar
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    Any idea how long the interval would be? Is it double?
    2015 Ford F-150 XLT 5.0
    2001 Chevrolet S-10 LS 4.3
    1998 Lincoln Navigator 5.4

  4. #4
    id say maybe 15-20k longer
    2018 F150 XLT Sport Supercab 2.7
    1968 Ford Thunderbird 2 door Landau 429 Thunderjet V8 1 of 950

    Past: 16 F150 5.0 , 14 F150 5.0, 07 F150 5.4, 03 Ranger 4.0

  5. #5
    Senior Member dchawk81's Avatar
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    Hm. Now I have to decide whether it's worth the premium cost. I can use tradional old Mercon cheap. Mercon V is more expensive, and synthetic even moreso.
    2015 Ford F-150 XLT 5.0
    2001 Chevrolet S-10 LS 4.3
    1998 Lincoln Navigator 5.4

  6. #6
    Senior Member dchawk81's Avatar
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    Looks to me like Valvoline Maxlife is the best compromise for the transmission and transfer case.
    2015 Ford F-150 XLT 5.0
    2001 Chevrolet S-10 LS 4.3
    1998 Lincoln Navigator 5.4

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