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Thread: Recommended transmission fluid for SMG

  1. #1
    Join Date
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    '70 VW bus + '95 325i

    Recommended transmission fluid for SMG

    Before I get shot down with “use the factory fill” I’m curious if anyone has experience with oils that can help the smg shift less clunky. My car is at 201k miles, and It sometimes sounds like it’s shifting with a hammer. That may be an exaggeration, just normal smg things.

  2. #2
    dworthy's Avatar
    dworthy is offline Wagon meister :) BMW Tech Expert
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    Redline MTL 75W-90 is a good quality replacement for the factory fill, and I am assuming you mean to go into the 6-speed, not the hydraulics.
    Darin
    Current:
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  3. #3
    Join Date
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    '70 VW bus + '95 325i
    Yep, the gearbox oil. I’ve heard good things about the royal purple synchromax. I have run redline mtl (I believe that’s what it was) in zf in my e36 and it’s notchy when cold.

  4. #4
    dworthy's Avatar
    dworthy is offline Wagon meister :) BMW Tech Expert
    Join Date
    Nov 2010
    Location
    Grafenwoehr, Germany
    Posts
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    My Cars
    16 220i 05 325it 05 M3
    I have used Royal Purple in the diff of an E-36, but not in a transmission. Also you can mix the MTL with Redline ATF to remove that "knotchyness", normally 50/50.
    Darin
    Current:
    16 220i Active Tourer Platinsilver MET (C08)/Dakota Black (PDSW), P7ACA, P7LDA, P7LHA, P9BDA, 6sp Manual - Wife's new toy!
    05 325it Electric Red(438)/Gray(N6TT) ZCW, ZSP 5sp Manual Back set cover, trunk mat, Euro Infra-Rot front windshield, and mud flaps! Mr. Wagon My new Winter car.
    05 M3 Imolarot II(405)/Gray(N5TT) ZCW, ZPP 6sp Manual C.F. Lip, CSL diffuser, SSK, Euro Infra-Rot front windshield and a trunk liner! Mr. Go_Fast Stored for the Winter
    Past:
    95 318is Montreal Blue Met (297)/Beige(K1SN) RIP, killed by an Idiot.
    84 M535i gray market Burgandy Rot Met/Black Leather Lowered by Intrax on bilies, poly everywhere, B&B cat back system, K&N, and a hitch! Da Beast - Still running w/400k+!
    91 316i euro Tizianrot/Gray cloth - E-36 w/M-40 RIP, but great on gas! Best was 38 MPG
    82 528i euro Saphire Blue Met/Blue Leather RIP
    79 525 euro Green/Green RIP
    79 318 Silver/Black - The first one that got it all started
    M-Flight Member

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