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Thread: Best Transmission Oil, A543

  1. #1
    Garrett booster
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    Best Transmission Oil, A543

    Hi, guys & gals. Has anyone used the AMSOil Manual Synchro Transmission fluid, MTF 5W-30? I'm about to put my rebuilt A543 into my car and will soon need some top-quality oil. This AMSOil stuff is $15 a quart, but I'll need less than 3 quarts for the gearbox so the cost is not a big issue. Is this any good? Is there anything better? Thoughts, please!

    .......Ray

  2. #2
    Supporting Member II Turbo Mopar Contributor ajakeski's Avatar
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    Re: Best Transmission Oil, A543

    5w30 conventional motor oil is the factory fill. As for something better, that's a debate for the ages. Search here and you'll find a million different opinions.

    I've had good luck with 5w30, Redline MTL and Pennzoil Synchromesh MTL. Old transmissions seen to like Pennzoil best.

  3. #3
    Moderator Turbo Mopar Staff Force Fed Mopar's Avatar
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    Re: Best Transmission Oil, A543

    I have been running 5w20 motor oil for a while, seems to work good.
    Rob M.
    '89 Turbo GTC

    2.5 TIII stroker, 568 w/ OBX and 3.77 FD

  4. #4
    Garrett booster
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    Re: Best Transmission Oil, A543

    That's what I have in mine too. Mobil 5000 5w-30.

  5. #5
    Supporting Member Turbo Mopar Contributor
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    Re: Best Transmission Oil, A543

    Quote Originally Posted by lightbulb010 View Post
    That's what I have in mine too. Mobil 5000 5w-30.
    I had issues with several different brand of 5W30. They don't all work the same to my surprise, in fact Castrol 5W30 was terrible. Jackson suggested Mobil 5000 5W30 and it worked well. Over the last few year I blend with 25% Mobil 1 5W30 for good cold weather shifts
    Regards,
    Miles

    DD '87 Sundance T1, SLH with rear disks
    '87 CSX #432 2.5 CB TII, SLH

  6. #6
    turbo addict
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    Re: Best Transmission Oil, A543

    I used a combo of synchromesh and 15-40 shell rotella. I thought the synchromesh felt really thin so put a little heavier oil to balance it out. Works good down here in hot as hell south Carolina.

  7. #7
    Supporting Member II Turbo Mopar Contributor ajakeski's Avatar
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    Re: Best Transmission Oil, A543

    Just don't use 80-90. The way the oiling system on the transmission is designed, thick oils do not circulate very well. People thing that since it has gears, you use gear oil.

  8. #8
    Garrett booster
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    Re: Best Transmission Oil, A543

    Thanks for all the suggestions. I've decided to go with Mobil 5000 5W-30. I like what Jackson S. said about it, and I suspect an older transmission, even with new synchros and bearings, is going to like something similar to what it used to have, which was not synthetic. I was about to try RedLine until I read of Jackson's experiences. I could not find enough history of those using AMSOil. The consensus on this forum among those with lots of experience seems to be that Mobil Super, 5000-Mile Protection, conventional oil (to give it its proper name), in 5W-30 is tops for the old A543.

    All best, until my next question.

    ........RayO

  9. #9
    Super Moderator Turbo Mopar Staff 135sohc's Avatar
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    Re: Best Transmission Oil, A543

    I have tried them all and still come back to plain engine oil every time.
    1994 Shadow Sedan. 2.2 N/A, A568 400,000 miles. "the science experiment"
    1987 Shelby CSX #418. Long term rebuild and restore ?

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