Mark VIII Correct Power Steering Fluid?

Lincoln Mark VIII

  1. LS-jsf

    LS-jsf Dedicated LVC Member

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    Hello all, thank you in advance for your help. I was not able to find what I wanted to know in a search here. The owners manual says to use Mercon ATF power steering fluid in a '98 Mark VIII. Can you use Mercon V today in it? If so, is it ok to use Mercon V if some of the original ps fluid is still in there? And how much ps fluid does it hold?

    *Edit* I found this TSB (07-1-7) that states the '96-'98 Mark VIII should switch from Mercon ATF to Mercon V for power steering. Can these two fluids be mixed at all?

    http://cdn.lrsstatic.com/downloads/tsb05-14/tsb07-01-07.pdf
     
    Last edited: May 2, 2017
  2. chris2523

    chris2523 93 Mark VIII

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    yeah you'll be fine.
     
  3. LS-jsf

    LS-jsf Dedicated LVC Member

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    Ok thanks.
     
  4. Kerrigan

    Kerrigan Active LVC Member

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    in our 1997 we've used off-the-shelf PS fluid with no ill effects in 86,000 miles. But it doesn't leak any either ...
     
  5. chris2523

    chris2523 93 Mark VIII

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    power steering fluid is ok but mercon is better.
     
  6. Kerrigan

    Kerrigan Active LVC Member

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    Would it be any benefit to siphon out what is in the reservoir and replace it with MERCON V in this 1997?
     
  7. germansheperd

    germansheperd Active LVC Member

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    Most likely no benefit.
     
  8. Kerrigan

    Kerrigan Active LVC Member

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    Thanks.
     
  9. 91 LSC SE

    91 LSC SE Dedicated LVC Member

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    it may be a benefit to drain and flush the system out completely if it hasn't been done before. The original fluid was red if not mistaken and if yours is like mine brown, I think it would benefit the rack and pump. i have heard other members having steering issues with the wheel pulsing of which I'm experiencing now. I read other members had that issue and they flushed the power steering fluid and it corrected the problem. After all it is transmission fluid and if tranny fluid looked that brown everyone would change it, and likely before it got to that brown.
     
  10. 97 Octane

    97 Octane Dedicated LVC Member

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    Flushed mine a couple years ago. Fluid was brown also.

    Refilled the reservoire with Castrol GTX Mercon V Transmission Fluid. No ill effects since.
     

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