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#4443261 - 06/27/17 10:24 PM Replaced Differential fluid today
barkingspider Offline


Registered: 12/22/13
Posts: 2049
Loc: socal
Based on the dealer records / receipts from the previous owner, it doesn't appear the diff fluid was ever replaced so I decided to do it today.


Removed the full plug first


Removed the drain plug, oil didn't look bad but there was stuff on the magnet




I filled w supertech 80w90, will run for about 3k miles as a rinse then go with a full syn 75w90.


Took it for a drive and it runs normal and no whining.
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#4443266 - 06/27/17 10:29 PM Re: Replaced Differential fluid today [Re: barkingspider]
901Memphis Offline


Registered: 08/14/10
Posts: 12893
Loc: Northern Kentucky
Good idea on the extra flush
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#4443295 - 06/27/17 11:00 PM Re: Replaced Differential fluid today [Re: 901Memphis]
andyd Offline


Registered: 09/25/04
Posts: 7156
Loc: Marshfield , MA
Why flush? Unless there was a problem.. A few bits of steel dust isn't a disaster.
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#4443317 - 06/27/17 11:29 PM Re: Replaced Differential fluid today [Re: andyd]
hank55 Offline


Registered: 06/25/11
Posts: 23
Loc: SO.CA,USA
Good Pictures!
Henry

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#4443518 - 06/28/17 08:04 AM Re: Replaced Differential fluid today [Re: barkingspider]
MarcS Offline


Registered: 11/18/16
Posts: 183
Loc: PA
really no need to flush a differential. It's not like there are any small passages to clean

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#4443564 - 06/28/17 09:07 AM Re: Replaced Differential fluid today [Re: barkingspider]
zeng Offline


Registered: 09/01/15
Posts: 2188
Loc: Malaysia
What's the used oil viscosity grade and its mileage ? ...... looks serviceable btw.

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#4443737 - 06/28/17 11:26 AM Re: Replaced Differential fluid today [Re: barkingspider]
Lolvoguy Offline


Registered: 02/06/14
Posts: 2342
Loc: Canada
Looks good thumbsup

How do you know if you've over/under filled it?
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#4443742 - 06/28/17 11:30 AM Re: Replaced Differential fluid today [Re: Lolvoguy]
MarcS Offline


Registered: 11/18/16
Posts: 183
Loc: PA
Originally Posted By: Lolvoguy
Looks good thumbsup

How do you know if you've over/under filled it?


differentials have a drain hole and a fill hole. with the vehicle on a level surface, you fill until fluid starts leaking out the fill hole and then cap it when the stream slows down to a drip

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#4443768 - 06/28/17 11:47 AM Re: Replaced Differential fluid today [Re: zeng]
barkingspider Offline


Registered: 12/22/13
Posts: 2049
Loc: socal
Originally Posted By: zeng
What's the used oil viscosity grade and its mileage ? ...... looks serviceable btw.


Used fluid was FF 75w90 (assume GM ac delco) w over 116k miles on it, did not do a uoa on it. It didn't look bad at all.
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#4443780 - 06/28/17 11:57 AM Re: Replaced Differential fluid today [Re: MarcS]
mightymousetech Offline


Registered: 04/03/17
Posts: 1444
Loc: Ontario, Canada
Originally Posted By: MarcS
Originally Posted By: Lolvoguy
Looks good thumbsup

How do you know if you've over/under filled it?


differentials have a drain hole and a fill hole. with the vehicle on a level surface, you fill until fluid starts leaking out the fill hole and then cap it when the stream slows down to a drip


I wish mine had a drain plug. Stupid BMW.
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#4443782 - 06/28/17 12:00 PM Re: Replaced Differential fluid today [Re: mightymousetech]
MarcS Offline


Registered: 11/18/16
Posts: 183
Loc: PA
Originally Posted By: mightymousetech
Originally Posted By: MarcS
Originally Posted By: Lolvoguy
Looks good thumbsup

How do you know if you've over/under filled it?


differentials have a drain hole and a fill hole. with the vehicle on a level surface, you fill until fluid starts leaking out the fill hole and then cap it when the stream slows down to a drip


I wish mine had a drain plug. Stupid BMW.


what a pain. do they want you to pump it out with a special dealer-only tool? that would be typical for the germans

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#4443856 - 06/28/17 12:53 PM Re: Replaced Differential fluid today [Re: barkingspider]
Silverado12 Offline


Registered: 02/26/13
Posts: 3114
Loc: Central Virginia
I thought about getting the Ford Racing aluminum pan (with drain plug and fill plug instead of a pan w/o anything) for my 2000 Mustang, but decided against it because I used synthetic 75W-140 and that should last another 100K miles. I had to pump mine in too. FWIW my fluid looked about like yours with a little more shavings on the plug. I wiped a lot of crud off the pan and paper toweled the inside of the diff best I could, so the flush isn't a bad idea since you can't get to the innards of yours.


Edited by Silverado12 (06/28/17 12:58 PM)
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#4443906 - 06/28/17 01:28 PM Re: Replaced Differential fluid today [Re: MarcS]
mightymousetech Offline


Registered: 04/03/17
Posts: 1444
Loc: Ontario, Canada
Originally Posted By: MarcS


what a pain. do they want you to pump it out with a special dealer-only tool? that would be typical for the germans


BMW considers the fluid "lifetime", so they never change it. Had to suck it out using my brake bleeder.
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#4443925 - 06/28/17 01:48 PM Re: Replaced Differential fluid today [Re: mightymousetech]
MarcS Offline


Registered: 11/18/16
Posts: 183
Loc: PA
Originally Posted By: mightymousetech
Originally Posted By: MarcS


what a pain. do they want you to pump it out with a special dealer-only tool? that would be typical for the germans


BMW considers the fluid "lifetime", so they never change it. Had to suck it out using my brake bleeder.


As i just commented upon seeing the condition of my "lifetime" transmission fluid at 65k, me and the automakers are operating on a different definition of "lifetime." Theirs is clearly "just past the point where we don't need to pay for warranty claims"

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#4443934 - 06/28/17 01:53 PM Re: Replaced Differential fluid today [Re: barkingspider]
blupupher Offline


Registered: 08/27/04
Posts: 4423
Loc: Katy, Republic of Texas
Fluid coming out did not look too bad.
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