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DIY: Do It Yourself
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Old 11-03-2014, 03:28 PM   #1
sk55
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Join Date: Sep 2014
Location: westchester
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My Ride: 330xi
Changing Differential fluid

hi guys,

my car 2005 330xi hit 200k miles... i don't the differential fluid has ever been changed.

i think the dealer told me it was a lifetime fluid.

my fear is that, i put new differential oil in and it cause it to fail?

any tips or input is appreciated.
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Old 11-03-2014, 04:06 PM   #2
Tangent_
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"Lifetime" fluid is pure marketing, not engineering. Don't worry about a change harming the diff in any way. As long as you use the proper fluid (I use RedLine 75W90 changed every 100k) it'll be fine. In automatic transmissions a fluid change after too long running old fluid can be worrisome because of the fear of the fresh oil and detergents knocking bits of crud loose that clog passages. A differential doesn't have anything like that to worry about. Just remember to remove the fill plug before the drain, and check if yours needs a replacement washer; not all diff plugs do.
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Old 11-03-2014, 06:06 PM   #3
Sansho
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Go ahead and change the differential fluid. I used Mobil 1, but others, as Tangent mentioned, will work fine too. You can look before you start to see if yours has an aluminum washer or not ... if not, you'll need to order a new plug with integrated rubber surround/washer.
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Old 11-04-2014, 09:22 AM   #4
markusmarkus
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ALWAYS remove the filler plug before draining the fluid. Why? Suppose you drain the fluid and then can't get the filler plug out? OOOOPS!
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Old 11-04-2014, 03:14 PM   #5
kd7iwp
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I replaced mine with Redline and have had no issues. Done the same to my E30 and twice on my 2002 VW Golf (transmission/diff fluid in that case). I recommend you go for it.
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Old 11-04-2014, 05:46 PM   #6
JDUTHIE
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what OP is afraid of is called "fluid shock" and technically its definately a possibility when changing fluid that had been in there for 200k..... But on that note I HIGHLY HIGHLY HIGHLY doubt youll run into any issues, aslong as your not experiencing whine etc... FWIW my fluid at 130k was still gold, and didnt have the charicteristic smell/coloer of burnt gear lube. CHANGE THE LUBE=PROFIT
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Old 11-05-2014, 08:41 PM   #7
Kye7
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Another question on the differential, I have the same car.
On the fill plug, it seems my wrench and hex bit are too large, and they hit the bar in the back directly next to it, only allowing my 14-mm hex bit about 1/4 of the way in.. Any way to remedy this?
These are the ones I bought, using a 1/4 drive ratchet. http://www.amazon.com/gp/product/B003NU9O0G

Last edited by Kye7; 11-05-2014 at 08:41 PM.
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Old 11-06-2014, 04:42 AM   #8
SilberVogel
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Quote:
Originally Posted by Kye7 View Post
Another question on the differential, I have the same car.
On the fill plug, it seems my wrench and hex bit are too large, and they hit the bar in the back directly next to it, only allowing my 14-mm hex bit about 1/4 of the way in.. Any way to remedy this?
These are the ones I bought, using a 1/4 drive ratchet. http://www.amazon.com/gp/product/B003NU9O0G
You can buy a stubby 14mm hex bit designed specifically for tight spaces, which looks like this:



Bimmertools (forum sponsor) sells them individually here: http://www.bimmertools.com/Perfect-f...mstubby3-8.htm.

I bought a 9-piece set by Titan from Northern Tool and they work great: http://www.amazon.com/Titan-Stubby-I...TK3LSQGM4IINMM. If you go to their main site, coupon code "192615" should get you an additional $5 off.

+1 on Redline 75W90, as well.
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Old 11-06-2014, 09:54 AM   #9
markusmarkus
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+2 on Redline. I've been using Redline lubes for decades. Stuff is the best. Nuf sed.
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