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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 04-10-2015, 08:41 PM   #1
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Join Date: Sep 2014
Location: Kansas City, KS
Posts: 94
My Ride: 2005 325xi
Transmission, diff, and xfer case fluids

So I've been trying to do some research on what fluids to use for the job but I wanted additional opinion from forum members.

I was thinking about using Mobile 1 75w-90 fluid for both the rear and front differentials.

I'm not finding a recommended fluid for the transfer case.

And as for the transmission, I'm not sure if it's a GM or ZF, I haven't yet lifted the car. It's a 2005 so I think it'd be a GM? It's an auto.
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Old 04-10-2015, 08:58 PM   #2
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Join Date: Aug 2014
Location: Wisconsin
Posts: 122
My Ride: 2004 330xi
I'm actually looking at doing these on my 2004 330xi. I'm using Mobil 1 75w-90 for the front and rear differentials (0.7 and 1.0 liters).

For the 6MT (1.6 liters) I've heard that Redline ATF D4 is typically used, but Royal Purple Synchromax seems to be a good alternative for the BMW manual transmissions. I plan on using the same stuff in the TC (.24 liters), I just haven't decided which of the two I want to use. I'm currently leaning toward Redline, as others have used it successfully, even if the Royal Purple might be slightly better.

Turner Motorsport sells Redline ATF D4 for the TC and the MT. I also referenced this thread and this thread.
PA Soft 1.4 for Dummies

Coding in the WI area - $20

Clutch Stop - $5 shipped

Last edited by nallman; 04-10-2015 at 09:05 PM.
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Old 04-10-2015, 09:40 PM   #3
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Join Date: Sep 2014
Location: Kansas City, KS
Posts: 94
My Ride: 2005 325xi
They seem to reference those fluids for a MT, but since mine is an auto, does it still apply? Looks like I'll try the Redline D4 ATF for the transfer case.

Last edited by johnnyv06; 04-10-2015 at 09:55 PM.
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Old 04-10-2015, 10:44 PM   #4
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Join Date: Sep 2014
Location: Kansas City, KS
Posts: 94
My Ride: 2005 325xi
I'm finding I should be using Dexron VI in my GM transmission. When I look up my VIN in realoem, I come out with A5S390R and that's what I'm recommended.

This wouldn't be so hard if everyone on the internet didn't have a different opinion on what's right or wrong haha.
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