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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 11-19-2016, 05:46 PM   #1
Registered User
Join Date: Nov 2015
Location: Space Coast Florida
Posts: 557
My Ride: 2005 330ci ZSP
05' 330ci Rear diff fluid change.

Changed my rear differential fluid today in preparation for 3,000 miles of driving over the next 6 weeks. Some notes for those of you who haven't done this: It's very easy to do took maybe :45 mintutes tops. After safely jacking the car up and making sure it's level.

1)Always remove the fill bolt (14mm) first. I pre soaked mine with PB.
2) I used a 1/2 drive 14mm bolt on a 1/2 inch breaker bar. (A 3/8 drive would be perfect but I couldn't locate a 3/8 drive 14mm drive bolt.
3) I didn't get a photo of the 79,000 fluid but it was fairly dark. I assumed it was the origainal because it smelled like crap. (Pentosin maybe)
4) Refilled the fluid which took slightly over 1 bottle. I did some research and it boiled down to either Redline or Liqui Moly. I have Redline 75W-90 in my SSG/SMG gearbox so I decided to try something different. I used liqui Moly Full Synthetic 75W-90 GL5
For non-Limited slip "open differentials. $16.00 from ECS tuning.
5) I purchased a fluid transfer pump from Autozone for less than $15.00 but didn't use it because the Liqui-Moly bottles have a convenient little extendable tube built into the bottle. I'll save the pump for a gearbox flush.
6) I went by the dealer to pick up crush washers for the drain and fill bolts but realized the bolts were the built in gasket type which I cleaned off and reused.
7) After filling the fill hole until fresh fluid spilled out you clean it off, attach the fill bolt and tighten. I believe the bolts are supposed to be torqued to 42ft lbs (not 100% sure) but I've been wrenching for a while now and I simply bottom out the bolt then snug it up tight after that.
8) Test drove the car on a short highway run at 60mph and to be honest, I couldn't tell a difference in sound or gear changes even with the windows up and AC off.
And that's it.
It'll be a nice piece of mind knowing I've got fresh Gold colored fluid back there.
Some pics.
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Technically 05SSG

Last edited by 05SMG; 11-19-2016 at 06:40 PM.
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Old 11-19-2016, 10:25 PM   #2
Registered User
Join Date: Jan 2008
Location: yonkers
Posts: 1,189
My Ride: 05 330ci ZHP
Should have done tranny fluid as well. I try to change both at the same time since its the same job and its right there
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Old 11-20-2016, 09:39 AM   #3
Registered User
Join Date: Nov 2015
Location: Space Coast Florida
Posts: 557
My Ride: 2005 330ci ZSP
Yup. Did that with the new clutch this summer. On my gearbox there is plate that I have to remove so it's a little more involved than the rear diff.

Technically 05SSG
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