Thread: Dexron III or Dexron VI?

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  1. #1 Dexron III or Dexron VI? 
    GT Level Member Brammer's Avatar
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    2002 GP GTP 99k I suspect it's on the original fluid, starting to smell a little off. Time for a fluid and filter change. Should I go with Dexron III or the newer stuff? Also, is the Dex/Merc stuff good for DexIII requirements?
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  2. #2 Re: Dexron III or Dexron VI? 
    Killa Bee Scottydoggs's Avatar
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    pull the dip stick red it, use what ever it says to use.

    new dex is thinner. not always the best for a older dex 3 tranny. as far as im concerned any ways, other say use and its fine. ill just use what it is supposed to use.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  3. #3 Re: Dexron III or Dexron VI? 
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    I AM ON MY 4th TRANSMISSION 1999 Grand Prix GT 170,000 miles. I just had the filter changed on this 4th one at 25,000. The remanufacture company used Dex 3 when this transmission was put in and recommends changes only be Dex 3. I regularly service my transmissions at 30,000 mile interval's. Who knows if the other transmissions went because Dex 6 was put in? I call up some trans oil companies and they recommend the Dex 6 equivalents of DEx 6. When I asked them why they said because that's what GM recommends and they cant recommend something else. 4 transmissions later do I have to spell out what I think of anything GM recommends.
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  4. #4 Re: Dexron III or Dexron VI? 
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    Quote Originally Posted by RM686 View Post
    I AM ON MY 4th TRANSMISSION 1999 Grand Prix GT 170,000 miles. I just had the filter changed on this 4th one at 25,000. The remanufacture company used Dex 3 when this transmission was put in and recommends changes only be Dex 3. I regularly service my transmissions at 30,000 mile interval's. Who knows if the other transmissions went because Dex 6 was put in? I call up some trans oil companies and they recommend the Dex 6 equivalents of DEx 6. When I asked them why they said because that's what GM recommends and they cant recommend something else. 4 transmissions later do I have to spell out what I think of anything GM recommends.
    sounds like you need to buy a ford.
    - 2001 Grand Prix XGT -- 11.21@124MPH
    - 2010 Chevy 2500HD LTZ -- Car hauler
    - 2011 BMW 328i Xdrive -- Wife's Daily
    - 2014 Ford F250 crew cab -- 6.2 liters of ford fail
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  5. #5 Re: Dexron III or Dexron VI? 
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    Quote Originally Posted by Brammer View Post
    2002 GP GTP 99k I suspect it's on the original fluid, starting to smell a little off. Time for a fluid and filter change. Should I go with Dexron III or the newer stuff? Also, is the Dex/Merc stuff good for DexIII requirements?
    probably fine with either. if you arent in a performance application i would say stick with III since its cheaper...

    before i had mine built by TEP i ran III.

    just dont flush the trans or you will have issues.
    - 2001 Grand Prix XGT -- 11.21@124MPH
    - 2010 Chevy 2500HD LTZ -- Car hauler
    - 2011 BMW 328i Xdrive -- Wife's Daily
    - 2014 Ford F250 crew cab -- 6.2 liters of ford fail
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  6. #6 Re: Dexron III or Dexron VI? 
    Turbo is the way to go. REDCRAPGP's Avatar
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    Quote Originally Posted by RM686 View Post
    I AM ON MY 4th TRANSMISSION 1999 Grand Prix GT 170,000 miles. I just had the filter changed on this 4th one at 25,000. The remanufacture company used Dex 3 when this transmission was put in and recommends changes only be Dex 3. I regularly service my transmissions at 30,000 mile interval's. Who knows if the other transmissions went because Dex 6 was put in? I call up some trans oil companies and they recommend the Dex 6 equivalents of DEx 6. When I asked them why they said because that's what GM recommends and they cant recommend something else. 4 transmissions later do I have to spell out what I think of anything GM recommends.
    Or stop throwing in JY transmissions because I'm sure you would of been on your 2nd one had you had the right place rebuild it for you


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  7. #7 Re: Dexron III or Dexron VI? 
    Moderator DanPrixGTP's Avatar
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    When I did a pan drop / filter change, I added 7-8 quarts of dex 6. It meets and exceeds all OE requirements of Dex III, plus my local parts store didn't even carry Dex III.

    Im 35,000 miles on Dex 6 without an issue.
    '97 GTP - Stage 2 Heads, 90# Springs, 1.9 Harland Sharp Rockers, Gen V, 3.0, Intake, N* TB, LQ4, FSIC, 10.5mm Wires, Poly Mounts, SLP Headers, Borla Exaust, Built Trans - SOLD*

    '08 G8 GT - 6.7L 408CI Stroker, 239/254 Cam, Fast Intake, 102mm TB, CAI, Full Exhaust.





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  8. #8 Re: Dexron III or Dexron VI? 
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    Quote Originally Posted by NebTurboST5 View Post
    sounds like you need to buy a ford.
    Had a ford thunderbird 1989. Put 237,000 miles on it with no problems before I bought my Grand Prix. Unfortunately Ford now has it problems. Next car will be Japanese.
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  9. #9 Re: Dexron III or Dexron VI? 
    The Blue One blueguy's Avatar
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    Dave @ TEP recommends DexIII.

    Thicker fluid...OE specs. I've ran DexIII always. Never had an issue.
    Sold WBody's: '03 Blue GTP/'98 Green GTP/'98 Silver GT/'05 GXP
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  10. #10 Re: Dexron III or Dexron VI? 
    GTP Level Member smoke14's Avatar
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    I've ran about 15,000kms on deck 6 with an intence shift kit and no issues. I also had a hard time finding dex 3.
    "You know, all that really matters is that the people you love are happy and healthy, everything else is just sprinkles on the sunday."

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  11. #11 Re: Dexron III or Dexron VI? 
    Turbo is the way to go. BillBoost37's Avatar
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    I've run and dumped both into these 4t65's.. the problem isn't the fluid..it's the transmissions.

    Go cheap and you'll feel it less when it grenades.

    Japanese huh?
    I drink..so consider that when reading my posts.

    2010 Audi A6 Dual IC's
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  12. #12 Re: Dexron III or Dexron VI? 
    GTP Level Member 99GT2dr's Avatar
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    Super tech dex iii/mercon is what I run in everything but the G8 (super tech dex vi). Been using it for a while, cheap and effective, and easily found at walmart.
    '11 Suburban LTZ
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  13. #13 Re: Dexron III or Dexron VI? 
    GTP Level Member Burbman's Avatar
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    Dexron VI is full synthetic and is backwards compatible with III. GM switched from III to VI around the 2004-5 timeframe. I have been using VI with no issues.

    I had a Jasper reman 4L80E installed in my '01 Suburban and they require a 5K fluid change after install. I called their tech hotline to ask whether III or VI, and the guy wouldn't say, he said either was fine. So right or wrong I made the decision to use VI in all my GM vehicles.

    FWIW, if you're on your 4th trans in such few miles you have bigger problems than what fluid to use.
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  14. #14 Re: Dexron III or Dexron VI? 
    GXP Level Member coolone's Avatar
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    I did complete swap to Dex6 with pan drop, no issues... Can't see how there would be... Slippery shyt that tranny stuff! Lolz...
    Overkill BBC Cam, YT 1.8 RR's, Rhodes Lifters, STGII Heads, GenV, Pacesetters, 3" Exh to Tips, TEP Trans. N*, ID 75# injectors/E85 coming soon
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  15. #15 Re: Dexron III or Dexron VI? 
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    I use Dex III also. No issues whatsoever.
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