Best Transmission Fluid

[Obioban]

I use redline MT90 but I don't drive it on the street. Works good when the trans is warm. I've used D4ATF in the past. It feels good for a couple of weeks and then its really difficult to rev-match downshift.

The best bet is OE fluid. Which is now DCTF? Anyone tried that?

You can still buy MTF LT2 from BMW.

[terra]

Did Pentosin start making it again? For a while everyone was out of stock of even the BMW branded stuff.

[Obioban]

Did Pentosin start making it again? For a while everyone was out of stock of even the BMW branded stuff.

I suspect Castrol is making it.

[kermmmit7]

What about these ?

https://www.turnermotorsport.com/p-382301-75w-80-mtf2-transmission-fluid-1-liter/

https://www.turnermotorsport.com/p-395258-ffl-4-75w-transmission-fluid-1-liter/

[Tbonem3]

First link is a conventional (non synthetic) gl5 lube (rear end). We want full synth gl4 tranny lube
Second link is DCT fluid that pentosin says is backwards compatible with the gl4 spec. I don't quite trust them.

[Ob917]

I used royal purple because it was at the shop and it's really notchy. I guess I should go to OE and see if it helps.

[kermmmit7]

First link is a conventional (non synthetic) gl5 lube (rear end). We want full synth gl4 tranny lube
Second link is DCT fluid that pentosin says is backwards compatible with the gl4 spec. I don't quite trust them.

Thanks, 10k miles ago I changed my transmission oil with liqui moly 75w90 . Transmission shifts smoother with liqui moly than redline but still feel difference during cold weather. Should I change it to oem oil?

[Tbonem3]

75w90 is too heavy for a street car except maybe one that lives in the desert or gets run hard. I would go to a straight 75w (mtf3) or OEM (bmw or pentosin) 75w80 mtf 2.

[CrookedCommie]

Putting Redline D4ATF in your transmission is great for shifting, since you'll be getting a new one shortly after.

[kermmmit7]

Thank you guys !

[Mystic3]

Well crooked commie, I tend to disagree with your opinion ,FWIW , which we all have one ,so far my tranny has gone over 50,000 miles with the redline d4atf....
for street. Works great...
.
..

[Tbonem3]

What automatic transmission did you install?

[CrookedCommie]

Well crooked commie, I tend to disagree with your opinion ,FWIW , which we all have one ,so far my tranny has gone over 50,000 miles with the redline d4atf....
for street. Works great...
.
..

That's Redline's opinion too, problem is, all the synchros I've used it on tend to disagree. The track car got switched to Ravenol MTF-2 and all high rpm grinding magically went away.

[r4dr]

What automatic transmission did you install?

Gear oil is gear oil is gear oil. I don't think your steering is powered by an automatic transmission?

[Obioban]

Gear oil is gear oil is gear oil.

... no, it isn’t.