M trans fluid upgrade

garz747 · 12-17-2022, 07:27 AM

Years back i changed out the oem manual trans fluid in my E46 330i(still have her) for royal purple synchromax. The difference was quite amazing. Going into gear at cold temps was greatly improved. Although once warm the M coupe box is not bad, is synchromax still the preferred choice as an upgrade? I believe the former is a ZF and the latter a Getrag box.

cbpip · 12-17-2022, 12:15 PM

Using the Ford Fluid, works great allows synchros to mesh as they should. Tried the Redline stuff, too thin synchros didn't like it. Not a fan of RP products due to inaccurate sheer strengths.

https://www.amazon.com/gp/aw/d/B000N...b_b_asin_title

wdb · 12-17-2022, 12:59 PM

I have RP Syncromesh in my M and it is a definite improvement over the Redline product the PO had used.

grannyknot · 12-17-2022, 02:40 PM

Quote:

Originally Posted by cbpip

Using the Ford Fluid, works great allows synchros to mesh as they should. Tried the Redline stuff, too thin synchros didn't like it. Not a fan of RP products due to inaccurate sheer strengths.

https://www.amazon.com/gp/aw/d/B000N...b_b_asin_title

I'll have to give the ford stuff a try next time, I hear good things about it.

maupineda · 12-17-2022, 08:42 PM

Interesting… the Mustang MT-82 guys are trying other stuff than OE. Lol, even RP… so who knows. And the M3 guys swear by the BMW OE fluid and say RP is crap

Westersund · 12-18-2022, 03:57 AM

Haven't changed trans fluid in the Z4 M, but I'm runing the good old ATF Dexron (III/)IV in the E46 M3 race car and it works great. Seen some run/recommend a 50/50 mix of MTF-LT2/3/4/5 and Dexron III/IV as well, to get a mix of cold temp gear changes and high temp tolerance.

wdb · 12-18-2022, 09:38 AM

Redline recommends their D4 ATF for the Z4M gearbox. I didn't like it.

https://www.redlineoil.com/d4-atf

https://www.redlineoil.com/find-products-for-my-vehicle

12-17-2022, 07:27 AM	#1
garz747 Captain 286 Rep 679 Posts Drives: 07 Z4MC 01 330i 18 X3 M40i Join Date: Jul 2015 Location: Toronto iTrader: (0)	M trans fluid upgrade Years back i changed out the oem manual trans fluid in my E46 330i(still have her) for royal purple synchromax. The difference was quite amazing. Going into gear at cold temps was greatly improved. Although once warm the M coupe box is not bad, is synchromax still the preferred choice as an upgrade? I believe the former is a ZF and the latter a Getrag box.
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12-17-2022, 12:15 PM	#2
cbpip Private First Class 151 Rep 198 Posts Drives: BMW Z4C 3.0si 3 pedal Join Date: Nov 2020 Location: MD iTrader: (0) Garage List 2007 BMW E86C [0.00]	Using the Ford Fluid, works great allows synchros to mesh as they should. Tried the Redline stuff, too thin synchros didn't like it. Not a fan of RP products due to inaccurate sheer strengths. https://www.amazon.com/gp/aw/d/B000N...b_b_asin_title
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12-17-2022, 12:59 PM	#3
wdb dances with roads 4732 Rep 4,096 Posts Drives: '07 E86, '02 996, '95 Seven Join Date: Jul 2015 Location: the perimeter iTrader: (4)	I have RP Syncromesh in my M and it is a definite improvement over the Redline product the PO had used.
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12-17-2022, 08:42 PM	#5
maupineda Captain 456 Rep 975 Posts Drives: E86 Z4MC Join Date: Jul 2012 Location: Detroit, MI iTrader: (3)	Interesting… the Mustang MT-82 guys are trying other stuff than OE. Lol, even RP… so who knows. And the M3 guys swear by the BMW OE fluid and say RP is crap Last edited by maupineda; 12-18-2022 at 08:04 AM..
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12-18-2022, 03:57 AM	#6
Westersund Captain 500 Rep 876 Posts Drives: BMW Join Date: Nov 2011 Location: Hallstahammar iTrader: (1)	Haven't changed trans fluid in the Z4 M, but I'm runing the good old ATF Dexron (III/)IV in the E46 M3 race car and it works great. Seen some run/recommend a 50/50 mix of MTF-LT2/3/4/5 and Dexron III/IV as well, to get a mix of cold temp gear changes and high temp tolerance. __________________ BMW M2 LCI -18 \| BMW 520DA Touring M-Sport -12 \| BMW Z4 M Coupe -06 \| BMW M3 -02 \| BMW Z3 Coupe -99 \| BMW 740i/6 -96 \| BMW M5 3.8 -92 \| BMW M535i -87
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12-18-2022, 09:38 AM	#7
wdb dances with roads 4732 Rep 4,096 Posts Drives: '07 E86, '02 996, '95 Seven Join Date: Jul 2015 Location: the perimeter iTrader: (4)	Redline recommends their D4 ATF for the Z4M gearbox. I didn't like it. https://www.redlineoil.com/d4-atf https://www.redlineoil.com/find-products-for-my-vehicle
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