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synthetic oil in tranny

This is a discussion on synthetic oil in tranny within the Manual Transmission forums, part of the Drivetrain category; was wondering if any of u use synthetic oil in your m6 and if u use a synthetic lube in ...

  1. #1
    philsls1
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    synthetic oil in tranny

    was wondering if any of u use synthetic oil in your m6 and if u use a synthetic lube in the rearend? if so what brands? thanks in advance.

  2. #2
    Member Orange SS's Avatar
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    Ermine White
    1964 Chevelle

    Mobil 1 and Mobil 1

  3. #3
    Member snake_skinner00's Avatar
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    Mystic Teal
    2000 Z28

    yep, i use the GM synthetics ... has treated me excellent so far

  4. #4
    Member tici's Avatar
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    1998 M6 vert TA

    There are a lot of discussions on the web about "the right tranny oil".
    Some say synthetic is bad for older trannies (older than 99) (??).
    I have a 97 Borg Warner, I tried mineral ATF, synthetic ATF, GM synchromesh and so far the mineral ATF is the best.
    With synthetic I had some grinding (!!), Synchromesh shifts smoother but it's a pain in winter: it needs to be warm or it will shift slow.
    So far the cheapest was the better.
    MODS: A4 > M6 conversion, SC raptor hood, Vortech V9 G-Trim SQ, homemade water-alcohol injection
    DYNO: 410 RWHP, 417 TORQUE @ 5 PSI

  5. #5
    The Rookie
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    Royal Purple
    Rear gets - MAX GEAR
    Tranny gets - Synchromax

    Shifts are smooooooth in my M6!

  6. #6
    Story of My Life!! BIG D's SS's Avatar
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    Black, Blue
    07 TBSS, 07 GSXR1000

    Reading an article in Gm High Tech about using synthetics in a m6. They say it is a bad idea cause it tends to cause leaks. I am staying away from syntheticsin mine just because of the leaks and mine has just been rebuilt. No need to start a problem that is not there already.

  7. #7
    The Rookie
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    Quote Originally Posted by BIG D's SS
    Reading an article in Gm High Tech about using synthetics in a m6. They say it is a bad idea cause it tends to cause leaks. I am staying away from syntheticsin mine just because of the leaks and mine has just been rebuilt. No need to start a problem that is not there already.
    Switched to Royal Puprle about 6,000 miles ago which equates to about a year ago for my garage queen. No leaks so far....

  8. #8
    Story of My Life!! BIG D's SS's Avatar
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    Quote Originally Posted by The Rookie
    Switched to Royal Puprle about 6,000 miles ago which equates to about a year ago for my garage queen. No leaks so far....
    That is good they were just saying that it tends to make it leak. I have thought about it but I know if it starts it won't stop, but mine has just been rebuilt about 5-6k ago. Getting ready to drain mine for the clutch install. Might go Royal Purple since I can buy it at cost.

  9. #9
    Member cailey37's Avatar
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    1998 Pontiac Trans Am

    ahhh the age old debate about synthetics......I think the best way to put it is you can't beat synthetics period!! If they do cause a leak how hard is it to change the front and rear seals????...not that hard at all......if you're pushing any kind of Torque do yourself a favor and use the synthetics......I only use Royal Purple......used to use Mobil 1 but found this to be better.....

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