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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 > rear diff and manual trans fluid advice please



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      04-17-2014, 11:25 PM   #1
oshusttoley
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rear diff and manual trans fluid advice please

next weekend i plan to install my new clutch,i have seen so many people on here use diff fluids. can someone chime in on whats the more recommended? it gets cold here, but i don't drive it really in the winter and more of a summer car so i should get thicker stuff right? everyone keeps talking about redline, can someone tell me which one and should i use oem or redline for the rear diff. ALSO, how much do i need for both. I have no idea on this and is there any other fluid i should change while under there? thanks!
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      04-18-2014, 06:38 AM   #2
bvanlieu
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Search is your friend: quite a few write ups. Rear end runs a 75/90 gear oil, plenty to chose from. I use Redline myself, about $16 a qt. Did it on my 44K 335d last weekend and the OEM fluid while not completely rancid was certainly ready for a change given what was suspended in it.

I do not know off hand the spec of the MT fluid for E90s: this is slightly different then rear end gear oil (there is MTL85, MT90, also 75/90NS for some transmissions as its a GL5 based oil. MTs are a tradeoff between better wear protection and 'slicker' feel.

Lifetime fluid my ass Deutchland...change it regularly, care for your car.

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      04-18-2014, 09:23 AM   #3
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There's a recent post about 10 posts down from this one.

For manual trans redline d6atf is the equivalent, I used d4atf, and some use mtf. Research which to use for your climate.
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      04-18-2014, 12:04 PM   #4
oshusttoley
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Quote:
Originally Posted by Jklad View Post
There's a recent post about 10 posts down from this one.

For manual trans redline d6atf is the equivalent, I used d4atf, and some use mtf. Research which to use for your climate.
Found it lol. So it get around 80-90 in the summer here and I won't drive this car in the winter, that being said do you think mtf is the way to go?
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      04-18-2014, 12:10 PM   #5
oshusttoley
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Quote:
Originally Posted by bvanlieu View Post
Search is your friend: quite a few write ups. Rear end runs a 75/90 gear oil, plenty to chose from. I use Redline myself, about $16 a qt. Did it on my 44K 335d last weekend and the OEM fluid while not completely rancid was certainly ready for a change given what was suspended in it.

I do not know off hand the spec of the MT fluid for E90s: this is slightly different then rear end gear oil (there is MTL85, MT90, also 75/90NS for some transmissions as its a GL5 based oil. MTs are a tradeoff between better wear protection and 'slicker' feel.

Lifetime fluid my ass Deutchland...change it regularly, care for your car.

- b
Thanks!
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      04-21-2014, 07:06 PM   #6
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My Indy put Rotra LSX 75w90 in my transmission.
Cold shifting is HARD. Once warm, you feel the shifts in the transmission more but it seems to work well.
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      04-21-2014, 08:35 PM   #7
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75w90 redline for the diff (1.1 qt for 328i). MTL for the trans (1.6 qt), needs to warm up a bit when cold (below 40), but better lubrication than ATF.
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      04-22-2014, 12:24 AM   #8
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I put in BMW OEM oil for the manual transmission. Shifts like normal and works fine on start-up even on cold winter days here in NorCal. I had redline MTF in my civic when I use to live in Hawaii, it was noticably bad on start up even in Hawaii where it doesn't get cold. I don't care that it felt fine once warmed up. I am more concerned with WTF it is doing to my transmission until it warms up. My guess is, it's not lubricating. I will stick to OEM here or at the very least, a fluid that feels smooth even on start-up.

For the diff, I am putting in Motul 75w90.
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