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Thread: High Mileage Trans Fluid Change

  1. #1
    Member brock's Avatar
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    High Mileage Trans Fluid Change

    My 92 500E has 122,xxx miles and I'm going through and changing all the fluids. The transmission fluid is looking old, has a slight brownish-red hue but smells ok. I can't find a trans fluid and filter change receipt in the service records.

    The trans shifts fine and my reverse gear engagement feels healthy (which seems to be a pseudo litmus test for trans health).

    Im concerned that I may induce a trans issue by changing the fluid out. I used to have old Range Rovers with ZF transmissions and if you were to change the fluid in one with high mileage you ran the risk of ruining the trans.This was due to the fact that you'd be removing all the acquiesced clutch material with the fluid. Once the "slick" new fluid was introduced the trans would start to slip. I'm hoping this isn't the case with the 722.3 unit in the 500E.

    Any risk in changing the fluid on a high mileage car that potentially hasn't had a change in a long time?

    Thanks in advance for the info.
    1992 500E Spruce Green
    1987 Porsche 944 Turbo
    2005 Land Rover LR3 G4 Challenge Edition
    1963 Jeep Wagoneer
    1965 Ford Mustang

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    .036 Hoonigan™
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    Re: High Mileage Trans Fluid Change

    If the fluid is not terrible, you SHOULD be ok. Failures due to changing the fluid & filter are bloody rare. IIRC, this was discussed previously, and the consensus was that it's riskier on a trans with really bad/brown/burned fluid. (Klink?)

    Anyway - I'd go for it. Use Dexron-III fluid (not a fluid rated Dexron-VI, in an old/worn trans). Make sure to drain the converter also. It will take 8.0-8.5 quarts to re-fill. Search the forum for How-To writeups & other info. If you do get any slight slippage afterwards, just turn up the vacuum modulator 0.5-1.0 turns CW. While the pan is off, I'd install the K1 spring upgrade too... pic attached, it's cheap and easy to install. I'm personally partial to synthetic (Red Line D4 or High Temp, Mobil-1, Amsoil ATF (not ATL)) but dino is fine if you change it more frequently.

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    Senior Member Eno's Avatar
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    Re: High Mileage Trans Fluid Change

    Thank you for the info guys and thanks for the proactive recommendation for replacing that part.
    I am planning to change the tranny fluid also and was advised to use Mobil 1 as per below photo.
    IMG_2777.JPG


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    E500E Guru Dario's Avatar
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    Re: High Mileage Trans Fluid Change

    Quote Originally Posted by Eno View Post
    Thank you for the info guys and thanks for the proactive recommendation for replacing that part.
    I am planning to change the tranny fluid also and was advised to use Mobil 1 as per below photo.
    IMG_2777.JPG


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    is that a DEX III?
    1993 500E
    1994 E320 cabriolet

  6. #5
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    Re: High Mileage Trans Fluid Change

    Just as a thought...

    I think this idea that the new fluid is "slicker" is a bit off. The viscosity will be different and there will be friction modifiers which will help it shift firmly. Fresh filter will decrease the restriction to the oil pump. All is good... now if you are incredibly worried and it has slight slipping issues, as Jono has suggested, use Type F.

    There is nolonger dex there- there is a universal Dex-Mercron I believe.

    Sincerely,

    Michael

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    Senior Member Eno's Avatar
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    Re: High Mileage Trans Fluid Change

    Quote Originally Posted by Dario View Post
    is that a DEX III?
    It was a few weeks ago and I believe the guy said it was Dex. II.
    That's why I am gonna read a bit more and may decide to use MB fluid just to be on the safe side.



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  9. #7
    Member brock's Avatar
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    Re: High Mileage Trans Fluid Change

    Thank you for the recommendations. I will gather the parts for the fluid change and the K1 spring upgrade. In a nutshell, what are the benefits of the K1 spring upgrade?
    1992 500E Spruce Green
    1987 Porsche 944 Turbo
    2005 Land Rover LR3 G4 Challenge Edition
    1963 Jeep Wagoneer
    1965 Ford Mustang

  10. #8
    E500E Guru Dario's Avatar
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    Re: High Mileage Trans Fluid Change

    Quote Originally Posted by Eno View Post
    It was a few weeks ago and I believe the guy said it was Dex. II.
    That's why I am gonna read a bit more and may decide to use MB fluid just to be on the safe side.



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    I dont think DEX II has been produced (labeled) for many years. Why not get Redline D4???? I use it in my 500e and she likes it
    1993 500E
    1994 E320 cabriolet

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    Re: High Mileage Trans Fluid Change

    Quote Originally Posted by Eno View Post
    I am planning to change the tranny fluid also and was advised to use Mobil 1 as per below photo.
    IMG_2777.JPG
    Eno, your photo shows standard Mobil ATF, not Mobil-1. It's OK to use, but is not synthetic, and is a Dexron-IID spec:
    http://www.mobil.com/english-CN/Pass...XMobil-ATF-220

    Link below shows Mobil-1 ATF:
    https://mobiloil.com/en/automatic-tr.../synthetic-atf




    Quote Originally Posted by brock View Post
    In a nutshell, what are the benefits of the K1 spring upgrade?
    It firms up the 2-3 upshift. The stock spring train is a bit soft and as the tranny wears, the 2-3 can tend to be softer than the other upshifts. This $3 upgrade can help fix this issue. Save your old/original springs in case you ever wanted to switch back (not likely). The difference is minor, don't expect a big change in the 2-3 shift quality. If you want any significant shift changes you need to check into the Superior shift kits (discussed in other threads, doesn't sound like you have any need for this though).

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    Re: High Mileage Trans Fluid Change

    Good to know. Thank you all for the information. I will perform the service and spring upgrade and share my thoughts.
    1992 500E Spruce Green
    1987 Porsche 944 Turbo
    2005 Land Rover LR3 G4 Challenge Edition
    1963 Jeep Wagoneer
    1965 Ford Mustang

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    E500E Guru Trae's Avatar
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    Re: High Mileage Trans Fluid Change

    Spoke with Jono about 722.3 fluid.

    He likes regular type F fluid for a more firm shift.

    I have been using Reline D-4 for all of my 722.3s, however have used type F in the 560SEC.

    Really did not notice much difference in type F shift vs. Redline D-4, however, type F will not be as slippery between shifts thereby extending (theoretically) the life of the tranny.
    Last edited by Trae; 11-18-2016 at 07:35 AM.
    Trae
    1992 500E Renntech
    1993 500E
    1990 560SEC/ 2001 SL500
    1991 560SEC ECE/1995 E320 Cabriolet

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