[Turkeybaster115]

Originally Posted by Socom

Hey Turkey did you know that all curren generation M's except for M3 take regular BMW 5W30 instead of the TWS?

yeah, and How did that work out for the E46 M3? Are they aware of the manufacturer's mandate? Notice the X marked by all the M engines, and the 10W 60 non LL01 requirement:

http://www.opieoils.co.uk/pdfs/BMW-O...s-and-Recs.pdf

[micah_675]

Hey turkey I just filled the diff about 3 weeks ago with RP 75W-140. I also replaced the "lifetime" fill transmission fluid with the syncromax fluid from RP. Moving the shifter is MUCH smoother than the stock crap in it.... (which was cloudy as all hell, not a good sign in oil)

[Turkeybaster115]

Originally Posted by micah_675

Hey turkey I just filled the diff about 3 weeks ago with RP 75W-140. I also replaced the "lifetime" fill transmission fluid with the syncromax fluid from RP. Moving the shifter is MUCH smoother than the stock crap in it.... (which was cloudy as all hell, not a good sign in oil)

Royal purple rear diff fluid is great stuff, but I think we have to get 75W 90 though, not 75W 140. Their manual trans fluid is good too. Enjoy the ride!

[F32Fleet]

Originally Posted by Turkeybaster115

yeah, and How did that work out for the E46 M3? Are they aware of the manufacturer's mandate? Notice the X marked by all the M engines, and the 10W 60 non LL01 requirement:

http://www.opieoils.co.uk/pdfs/BMW-O...s-and-Recs.pdf

I can't view the link on my phone but IIRC reading all the turbo M's do not take TWS. This could be because the cars are not likely to be tracked which is what TWS is intended for to begin with.

[AlanAZ]

Quote:
Originally Posted by micah_675 View Post
Hey turkey I just filled the diff about 3 weeks ago with RP 75W-140. I also replaced the "lifetime" fill transmission fluid with the syncromax fluid from RP. Moving the shifter is MUCH smoother than the stock crap in it.... (which was cloudy as all hell, not a good sign in oil)
Royal purple rear diff fluid is great stuff, but I think we have to get 75W 90 though, not 75W 140. Their manual trans fluid is good too. Enjoy the ride!

Correct, 75W90 in the Diff. Per the BMW TIS:

(USA) E9x N52 engines ('06-325i/330i, 328i,) rear diff is designated 188L/188LW and takes SAF-X0 (75w-90) with a 1 liter fill.

(USA) E9X N54 TT engine [and the M57TU (335d)] rear diff is designated 215L/215LW and takes SAF-XO (75w-90) with a 1.2 liter fill.


In addition, RP Synchromax is compatible with older BMW transmissions, but is the wrong viscosity for the E90 transmissions (too thick.) From RPs website

http://www.royalpurple.com/transmission-chart.html

Synchromax is compatible with MTF-LT-1 fluid (and before), but not MTF-LT-2 & 3, which is what E90 transmissions use (mostly MTF-LT-3, in some cases MTF-LT-2. Check the label on your transmission.)

http://www.e90post.com/forums/showth...&highlight=MTF

LT-3 can replace LT-2, but not the other way around. MTF-LT-1 is not compatible at all. While Sychromax does provide smoother shifts initially, it does not hold up well, and the shift quality degrades quickly and wears the gearbox. As Mr. 5 and others have found.

http://www.e90post.com/forums/showth...ht=redline+atf

Update: below I'm disparaged as an "internet" expert. I am by no means presenting myself as an expert, but merely presenting the facts of BMW MT fluid types, viscosity, and compatibilities; and relating my (and others) experience of running Sychromax in our cars.

[micah_675]

Ill see if i can get redline. As for grinding, I have not had any issues. I did have sticking issues with the OEM fluid, which is why I changed it. Ill try to keep it in the back of my mind to listen for anything different. As for right now, it only has about 600 miles on the fluid.

http://www.synlube.com/viscosit.htm#...arison%20Table

As you can see from this a 75w-140 has a higher temperature at which the viscosity breaks down at. There is no harm in running it. However if it called for a 75w-140 (as most LSD's do) it would NOT be acceptable to run 75w-90. On the chart look at SAE Gear. The ratings work the same way as a motor oil. The only reason you wouldnt run a 10w-60 in your cars is, it is thicker (at lower temperatures) and therefore will not provide adequate protection in the thigh places oil circulates through in your crank case. In the diff, its all about lubing bearings and gears, which thicker oil is MUCH better for.

[Turkeybaster115]

Originally Posted by micah_675

Ill see if i can get redline. As for grinding, I have not had any issues. I did have sticking issues with the OEM fluid, which is why I changed it. Ill try to keep it in the back of my mind to listen for anything different. As for right now, it only has about 600 miles on the fluid.

http://www.synlube.com/viscosit.htm#...arison%20Table

As you can see from this a 75w-140 has a higher temperature at which the viscosity breaks down at. There is no harm in running it. However if it called for a 75w-140 (as most LSD's do) it would NOT be acceptable to run 75w-90. On the chart look at SAE Gear. The ratings work the same way as a motor oil. The only reason you wouldnt run a 10w-60 in your cars is, it is thicker (at lower temperatures) and therefore will not provide adequate protection in the thigh places oil circulates through in your crank case. In the diff, its all about lubing bearings and gears, which thicker oil is MUCH better for.

If something feels right in your car, RUN IT. Don't listen to "internet" experts. For us AT guys, our stock trans fluid is Overpriced SH!t! Viscosity at 100C=5! our trans runs at 100C assuming you don't race it. I shudder to think whats happening to guys that track the thing, with that cough syrup in it!

[micah_675]

Syncromax is for MT only, not AT. It is ATF but you cant run it in Automatics. Sorry if I confused you guys, I have a 6-speed.