N54Tech.com - International Turbo Racing Discussion
(#1)
Old
Vbp6us's Avatar
Vbp6us Vbp6us is offline
Junior Member
 
Posts: 113
Join Date: Aug 2015
Car: 2008 335i E92 MT
Default Which oil do I use for the AT transmission? - 11-12-2018, 09:37 PM

I want to change the oil but I'm unsure what to change it with. What's a better oil to use?

ThanKS


2010 335i AT: Stock
Reply With Quote
(#2)
Old
Ron Vogel Ron Vogel is offline
New Member
 
Posts: 20
Join Date: Oct 2018
Car: E61 535Xi
Default 11-12-2018, 11:34 PM

https://www.zf.com/global/media/en_z...s/TE-ML_11.pdf

Although it has been reported the Mercon SP works just fine in the ZF transmissions. do a Google search for Mercon 6hp28 and decide for yourself

Last edited by Ron Vogel; 11-13-2018 at 12:46 AM..
Reply With Quote
(#3)
Old
BevsM3's Avatar
BevsM3 BevsM3 is offline
Junior Member
 
Posts: 172
Join Date: Mar 2017
Car: 2010 535i m sport wagon
Default 11-13-2018, 04:30 PM

I went with the kit ECS sells, it comes with Redline fluid. Tranny’s been great. BTW you will need 2 more quarts as the included amount is not enough. Could not find it locally so it cost me time.

535i xdrive
Reply With Quote
(#4)
Old
PR3CI5N335i's Avatar
PR3CI5N335i PR3CI5N335i is offline
Need4Speed
 
Posts: 1,083
Join Date: Nov 2011
Car: 2010 E90 335i M-sport
Default 11-14-2018, 06:11 PM

I used the OEM transmission fluid from BMW at 80k. Never had an issue with 680whp.


SOLD - FBO N54, Pure Turbos stage 2, TFT inlets, JB4/MHD, EOS intake manifold w/PI, Fuel-it stage 3
Reply With Quote
(#5)
Old
HyTeK's Avatar
HyTeK HyTeK is offline
New Member
 
Posts: 20
Join Date: Mar 2015
Car: 2009 335xi E90
Default 11-24-2018, 03:02 PM

Had Redline D6 put in at 45k miles, and now at 72k. Most of that time the car was around 400-450bhp with xdrive on a 2009 e90. Had the adaptations reset at that time. Shifts were a little slow/clunky the first 500 miles or so, but has been smooth ever since.
Reply With Quote
(#6)
Old
BMW135xi's Avatar
BMW135xi BMW135xi is offline
Junior Member
 
Posts: 226
Join Date: Jul 2016
Car: BMW 135I
Default 11-26-2018, 08:41 PM

Factory is pretty good oil or Lifeguard 6 ZF.
Reply With Quote
(#7)
Old
HyTeK's Avatar
HyTeK HyTeK is offline
New Member
 
Posts: 20
Join Date: Mar 2015
Car: 2009 335xi E90
Default 11-26-2018, 09:22 PM

Just for reference. This is a conversation I had with my old tuner. This is the reason I went with D6 over OEM or other fluids. Granted there was deeper discussions at the shop, but this was the beginning of the talks revolving what to use in our tranny.

Quote:
I recently had with An Engineer/Transmission fluid expert friend of mine Nick, who works at an independent lab and testing facility in Sweden. His facility does independent testing of transmission fluids and their affect on wet clutch assemblies. Nick also did his internship at BMW in Munich.


Redline D4 doesn't meet DexronVI requirements, definitely due to the higher viscosity and possibly also because it might not have the same additives (hard to say, because specs don't necessarily have requirements about what or how much additives are contained, as long as it passes certain tests to meet those specs). D6 meets LG6 and DexronVI specs and is backwards compatible with DexronIII. DexronVI has more friction modifier additives and has a lower viscosity, but the additives make up for that and protect the clutches even better despite the lower viscosity. The extra friction modifiers found in DexronVI lubricants make for a better clutch engagement. It's smoother because right before the clutch plates come in contact and lock, the friction modifiers (FM are weak surface active molecules) shear off the surface reducing the sudden high friction engagement. FM are similar in principle (but different in chemistry of course) to EP (extreme pressure) additives in GL-5 gear oils, but FM works at much lower contact pressures found on clutches.
Using the D4 with only DexronIII specs would be worse in just about every way. The viscosity is slightly higher, hurting economy and it likely won't protect any better, definitely not the clutches in the case that it has fewer FM additives.
But it all depends on how they formulate their additive packages. A thicker base oil with the same additives as D6 would probably be smoother, but it's hard to say what they actually do. The D6 meets the requirements of the Lifeguard 6, so I'd see no reason why you shouldn't just use the D6. LG6 is probably fine too, but it's hard to find specifications on that.
Another note is that at -20F outside, I don't think the car shifts significantly softer(Here nick is referring to his 99 BMW 530d that he drives in sweden)than when it's 100F out with a hot transmission. The oil viscosity is something like 500 times more viscous and I think that although the perception of clutch engagement harshness is dependent on viscosity and additive packages, it's more dependent on the additives. Even a thick oil is squeezed out pretty quick as the plates are designed to do that quickly/efficiently so they will engage in close to the same time, but the additives and clutch design will determine more the harshness of the engagement. It's the final engagement that you feel, not necessarily the very short time leading up to it (the fluid film won't transmit so much anyways). The difference between D6 and the D4 at 120C (the clutch contact temperature can be up to 150C driving it hard) is pretty small, and certainly not 500x difference. It's actually about a 1.2x difference at 120C and 1.15x difference at 150C by my math.
Reply With Quote
(#8)
Old
rcpro88 rcpro88 is offline
Junior Member
 
Posts: 267
Join Date: Aug 2016
Car: 535i
Default 11-26-2018, 10:19 PM

I used the redline ATF stuff. I actually flushed the trans via the transcooler and have no issues with the car hooking up from a dig and hard knockdown shifts. Trans has 185k miles on it fyi. Did partial flush at 100k and a full at 130k. ***** SAT flash helps a lot for those with a 535i/unable to use the alpina trans flash.


DON'T buy VRSF D.Ps or inlets! FBO, E85 Walbro 450, xHP trans flash
Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump




vBulletin Skin developed by: vBStyles.com
Copyright 2007 - 2020, N54tech.com