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E46 Xi Forum
The E46 XI was produced from 01-05 in sedan and touring body styles. Powered by either a 2.5L inline 6 in the 325xi or a 3.0L inline 6 330xi. Discuss all thing about BMW AWD E46 'Xi' here.

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Old 02-25-2013, 08:57 AM   #1
beemteam
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Tranfer case fluid?

Hello everyone this is my first ever post. I wanted to change my trans fluid and transfer case fluid and i had a question,......is the transfer case fluid the same fluid used in the transmission or is it a different fluid? Thanks ahead

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Old 02-25-2013, 09:03 AM   #2
SamDoe1
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Same if you have a manual, different if you have an automatic.

Use MTL in the transfer case.
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Old 02-25-2013, 09:26 AM   #3
beemteam
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Thanks samdoe1
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Old 03-03-2013, 11:11 PM   #4
jmo69
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What's the favorite brand for the T-case, Redline MT90?
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Old 03-04-2013, 10:55 AM   #5
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What's the favorite brand for the T-case, Redline MT90?
Yes.
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Old 03-04-2013, 11:48 AM   #6
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Our fluid of choice for the E46 transfer case is RedLine D4, also when changing the fluids in the case it's suggested to also replace the drain and fill plugs as well as the washers on them, I have a kit available HERE which makes it a one stop shop.

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Old 03-04-2013, 06:27 PM   #7
GCoop
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Gears deserve a gear oil so Redline MTL every change here. Even if it is a tad more viscous than the OE fill. I do it about every third oil change (30K) for cheap insurance.



Whatever you guys do CHANGE IT. I'd venture to say motor oil would be even be better than leaving the original fill in there a mile past 60k

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Old 04-13-2013, 04:39 PM   #8
jmo69
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Finally did this today, got 5 ounces of black $hit out and replaced it with some nice clean Pentosin MTF. Got to be better than before.
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Old 04-13-2013, 06:18 PM   #9
Kubica
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I use D4 in the TC and mix D4/MTL in the MT.
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Old 04-14-2013, 11:15 AM   #10
jmo69
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I've got some D4ATF, I might try a mixture the next time, maybe next oil change. I also have some Transyn that we use in the heavy duty Allison automatic transmissions in our redi-mix trucks. The transfer cases use a 50 weight synthetic oil that would probably work too.
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Old 04-14-2013, 08:32 PM   #11
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is it really worth replacing the drain and fill plugs like ECS Says?
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Old 04-14-2013, 08:54 PM   #12
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is it really worth replacing the drain and fill plugs like ECS Says?
Nope. Just get the new crush washer though. Use a pick to remove them from old plug if they're on there tight.
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