Best Transmission Fluid

[Tbonem3]

What automatic transmission did you install?

[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...
.
..

[kermmmit7]

Thank you guys !

[CrookedCommie]

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

[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.

[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?

[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.

[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.

[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/

[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.

[terra]

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

[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.

[bigjae46]

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?

[beefaroni]

Followup: Last night I changed out the Redline D4 ATF which had about 2000 miles on it for some Pentosin MTF-2. When I first bought the car, all 1-2 shifts and most 2-3 shifts were impossible without double clutching for the first few minutes of driving in colder weather. Changing to Redline D4 ATF helped significantly to where shifting was always possible but I had to be delicate for a few minutes until things warmed up to avoid crunchy no good sounds and feels.

This morning is a cold morning (35 F) and the cold performance is better than D4 ATF. Im sure the performance and smoothness will drop off after a couple hundred miles like it always seems to but the Pentosin has things running much better. The shift quality is almost decent.

I give the Pentosin MTF-2 a big thumbs up

[Obioban]

Not trying to fan flames here, BUT... reviews or thoughts on RP Synchromax?

garbage.