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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Mechanical Maintenance: Break-in / Oil & Fluids / Servicing / Warranty > Consensus on best MTF for California weather? Redline MT-90/MTL/D4 ATF/D6 ATF?



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      07-14-2014, 01:11 PM   #1
devtec
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Consensus on best MTF for California weather? Redline MT-90/MTL/D4 ATF/D6 ATF?

Hi all,

Looking to try to smooth out my 1-2 shift. Know this topic has been beaten to death, but have read every single thread on here about manual transmission fluids and haven't been able to find a consensus. Any advice for my E92 6MT?

From what I can gather, in order of most viscosity to least, it's:

Redline MT-90
Redline MTL
Redline D4 ATF
Redline D6 ATF

More viscosity = better protection, but may run into increased notchiness in cold climates.

Royal Purple Synchromax now recommended for our E90 transmissions, but smoothness effect disappears after a few months.

I'm leaning towards MT-90 or MTL, but don't have enough info to differentiate the two. Would also consider Amsoil MTF if anyone has any input.

Bottom line: what would safely give me the smoothest shifts in moderate California weather?

Thanks to all.
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      07-17-2014, 09:53 AM   #2
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Hi, here's my experience. I have an E90 335i 6Mt with 45K Miles and 1-2 shift was a little notchy as well. I intended to swith to Redline D4 as is slightly thicker than OEM, but once I was in the shop I decided to go with MTL as the D4 had not arrived in time to the shop.

Conclusion : I'm glad I switched to MTL instead of D4 or D6. It feels only slightly thicker than OEM and is smoother for the 1-2 shift, but I can still feel a little notchiness. I'd say it improved the feel by 30%, so not a night and day thing.

Also important to note : I replaced OEM trans support to RE support at the same time. I now feel a little more NVH in the shifter, but only because I'm paying attention : I'm sure my wife wouldn't notice. I feel this has helped too as the shifting action feels more solid, especially when shifting quickly in the higher revs (I'm running Cobb stage 2+)

Overall I'm very happy with the change so far, but remember I have not yet ran this setup in canadian winter so I might change my tune in January ! For you being in California, I would not hesitate to go with MTL. To significantly improve 1-2 feel, I would also push to MT90.
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      07-17-2014, 07:54 PM   #3
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either 75w-80 or -90 (check you owners manual). GL-5 API spec- no need to worry about brands. Look for the spec. Simple.
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      07-18-2014, 10:58 PM   #4
devtec
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Hi concorde, thank you very much for that response. That's exactly what I was looking for. For me it was between the redline MTL and Amsoil MTF. Decided to go with the Amsoil since it is just a bit less viscous than the MTL, yet still thicker than D4/D6. Expect it will perform very similarly to your MTL, but was just a bit closer to stock specs. Getting the flush next week, will report back on my results with the Amsoil MTF.
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