BMW MTF LT-4 specs and thoughts

Discussion in 'Tip's, Tricks and How To Articles' started by cristo, Jun 5, 2019.

  1. cristo

    cristo Well-Known Member

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    Just did a virgin oil analysis on a new bottle of BMW MTF LT-4 and got the results below:
    Also below is used oil analysis at 36,000 miles of what is supposed to be LT-4 also - this is in my 2009
    JCW Clubmanwith 36K on the odometer:

    I was surprised by how thick the unused OEM fluid is (100C 14.8 cSt, 40C 70 cSt, with calculated VI of 223 ! )
    Also surprised by how much it thinned out over 36K (100C 7.7, 40C 40.3) - still good numbers for a 6-speed Getrag.
    I was wondering if the previous owner added to or changed the gear oil from the factory fill, but he says no.
    Zeng on BITOG says (s)he's not surprised by the drop given the amount of viscosity index improver it must
    have to acheive 223 VI and that it just sheared down with use.

    Wondering if I should change it now with new LT-4 (have some), or use a more durable synthetic oil like
    Redline MT85 (75W85) (viscosities 12 and 62, VI 198) or Amsoil Manual Synchromesh Transmission
    Fluid MTF (5W30) (viscosities 10 and 50, VI 196),
    or something else entirely, or wait a year or so more to change it?
     

    Attached Files:

  2. MCS02

    MCS02 Moderator
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    I used the Redline and liked it,
     
  3. Dave.0

    Dave.0 Helix & RMW Powered
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    I never use Redline or Royal Purple ANYTHING.

    StIck with Amsoil or Motul and just change it now.
     
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  4. DneprDave

    DneprDave Well-Known Member
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    I don't like Amsoil, they market it like Mary Kay cosmetics.
     
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  5. MCS02

    MCS02 Moderator
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    Amsoil is a very good product. I have not tried their eyeshadow:D
     
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  6. DneprDave

    DneprDave Well-Known Member
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    #6 DneprDave, Jun 6, 2019
    Last edited: Jun 7, 2019
    I can't find any proof that Amsoil is any good, all there is on google is a lot of hype.
    Also, I'm not buying oil out of someone's trunk.
     
  7. MCS02

    MCS02 Moderator
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    My son ran Royal Purple in his mustang. We had seen videos of test with different oils. Royal Purple did very well.
     
  8. 00Mini

    00Mini Well-Known Member

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    It's not a an serious lubrication discussion until Bob the Oil Guy quotes start appearing. :)
     
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  9. MCS02

    MCS02 Moderator
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    Where’s Bob when you need him?
     
  10. cristo

    cristo Well-Known Member

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    #10 cristo, Jun 7, 2019
    Last edited: Jun 7, 2019
  11. ScottinBend

    ScottinBend Space Cowboy
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    Honestly.......use whatever you feel comfortable using. Then change it regularly depending on use. I don't believe there is that much difference in the products, as long as it is maintained.
     
  12. MCS02

    MCS02 Moderator
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  13. Crashton

    Crashton Club Coordinator

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    Oil threads can get as complex as tire threads. :confused:
     
  14. Dave.0

    Dave.0 Helix & RMW Powered
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    Not really, I think we all agree they are round and black.
     
  15. cristo

    cristo Well-Known Member

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    After thinking about all this for a while, I'm going to just stay with the BMW MTF-LT-4 and change it every 25-40K.
    It has a very high VI which overrides my concern about the high-ish 100C KV
    (non-tracked manual transmission fluid doesn't usually get nearly as hot as motor oil anyway)
    and even though it shears down a bit with time and miles, more frequent changes will take care of that just fine.
    Also, I already have a few bottles of it.
     
  16. Sully

    Sully Administrator
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    Agreed - if you already have a few bottles, use them. :)
     
  17. cristo

    cristo Well-Known Member

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    #17 cristo, Aug 1, 2019
    Last edited: Aug 1, 2019
    I changed the transmission fluid (thought to be old LT-4) to new BMW MTF-LT-4 recently.
    I was puzzled by the apparent big drop in viscosity in the old oil until I did some googling and
    noticed that the additive amounts (Calcium Phosphorus, Zinc, Magnesium) were very similar to Texaco
    MTF-94,which of course is commonly used as factory fill for lots of MINIs. I'll bet the factory doesn't pay
    much attention to whether the transmission has an MTF94 or an LT-4 sticker on it (like mine does)
    when they fill it.
    It's also much more believable that the viscosity would drop from 10.4 (MTF94) to 7.7 in 37K than from
    14.8 (LT-4) to 7.7.

    Actually, if I knew it had MTF94 in it I would have let it go to 50K and change it with MTF94 then.
    I guess it's much of a muchness anyway. I'm happy staying with the more robust LT-4 that's in there
    now and recommended for my MINI anyway.
     

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