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audivoodoo
04-01-2011, 06:52 PM
DIY: Rear Differential Fluid (http://www.audizine.com/forum/showthread.php/384943-FAQ-Rear-Differential-Fluid-Basics) Change


TOOLS, PARTS, MATERIALS:

~ 3/8 Socket Wrench
~ 3/8 6” Socket Extension
~ 3/8 Swivel-Head Socket Extension
~ 3/8 10mm Hex-Head Socket
~ 3/8 Torque Wrench
~ Fluid Transfer Hand Pump ( I used a cheap 6$ one from Autozone, but something like a Mityvac will save you a few hand cramps)
~ 1.9 Quarts of you favorite 75w90 Gear Oil (Here is a good FAQ to choose one. Thank you dparm (http://www.audizine.com/forum/showthread.php/384943-FAQ-Rear-Differential-Fluid-Basics))
~ A Lift or Jack and Jack Stands
~ Oil Catch Can.
~ Safety Glasses
~ 2 Beer’s

http://i1205.photobucket.com/albums/bb433/david-stg2/Car%20Stuff/IMG_1000000294.jpg
http://i1205.photobucket.com/albums/bb433/david-stg2/Car%20Stuff/IMG_1000000295.jpg
http://i1205.photobucket.com/albums/bb433/david-stg2/Car%20Stuff/IMG_1000000297.jpg
http://i1205.photobucket.com/albums/bb433/david-stg2/43f2f45d.jpg

Note: The following procedure is intended to be a guide only, and was accomplished on a ’04 B6 S4. If followed improperly, damage to you or your property is possible. I take no responsibility for your undertaking of this procedure. Accomplish at your own risk. Remember, Safety first.

DIFFICULTY:

This is extremely easy and can be accomplished by just about anyone who knows what the tools and parts listed above are. Total time for me with a lift was 20 Min. It will take a bit longer if you use a jack and jack stands or wait for the car to cool a little (you do want the oil to be warm thou).


PROCEDURE:




Disconnect the battery.
Beer sip
Set the E-Brake, block the front tires, lift the rear of the car and place on jack stands, remove jack. (Never work under a car supported only by a jack) Alternately and preferably lift the car with a lift.
Beer sip
Place oil catch can under the rear differential.
Beer sip
With a 10mm Hex-Head Socket attached to a swivel and 6” extension, remove the 10mm Hex-Head nut that is towards the top of the right hand side of the differential.
http://i1205.photobucket.com/albums/bb433/david-stg2/Car%20Stuff/IMG_1000000293.jpg
Beer sip
Now remove the 10mm Hex-Head nut on the bottom of the differential and drain all of the old oil.
http://i1205.photobucket.com/albums/bb433/david-stg2/Car%20Stuff/IMG_1000000289.jpg
New beer, beer sip
Reinstall the bottom nut and torque to 30ft lbs (40Nm) (This is what it was for my old car and couldn’t find the torque spec for the S4. will correct if someone posts it up)
Beer sip
Install pump on the quart of oil, install hose into the hole from the removed nut on the top right and pump away.
http://i1205.photobucket.com/albums/bb433/david-stg2/Car%20Stuff/IMG_1000000302.jpg
Beer sip
Add 1.9 Qts of oil, reinstall 10mm nut and torque to 30ft lbs (40Nm) and wipe up any excess drips.
Beer sip
Drop the car, reconnect the battery.
Finish beer.
Properly dispose of your oil and beer cans. Have a good day [wrench]

c13h18n2
05-15-2012, 07:32 PM
Sweet! Thanks! Question, though. Does it have to be Coors Light?

04 S4
05-16-2012, 03:58 PM
lol at the beer.

c13h18n2 - if you need a hand, I just did this friday lol

dparm
05-16-2012, 05:08 PM
Something to add here: the car needs to be level when you do this or you will not drain/fill the proper amounts. I suggest getting it on a lift if you can; otherwise, take the car off the jackstands and let it rest on its tires while the fluid is draining. You will want to pump in the fluid while it's level too, so either get it on the lift or four jackstands, or get a longer hose so the car can be on the ground.

You should refill it so the fluid is just below the "fill" hole, if I recall correctly. It's technically 4.1 pints = 2.05 qt = 1.94 L if you have a manual trans, and 3.2 pints = 1.6 qt = 1.51 L if you have the auto trans. I might be off a bit on those figures since I don't have the factory service manual, though if you fill to the very bottom of that hole it should be the proper amount. Hopefully someone can confirm.

masaraksh
05-19-2013, 04:50 PM
I did this today.

One tip I would recommend is to remove the axle shield on the rear pass side. It makes getting at the fill plug MUCH easier. The shield is held on by 3 bolts that are very easily removed with a 6mm hex socket.

SurferD
05-20-2013, 04:21 PM
Another tip if you're using Coors Light is to make sure the mountains are blue for optimum temperature as audivoodoo did.
Good write-up.

dparm
05-20-2013, 04:32 PM
Better yet, drink good beer.

jeffrey146
09-19-2014, 11:12 PM
Didn't drink the beer because I had to drive. However it all worked great for me.

B6A4Dave
12-09-2014, 04:47 PM
Semi-Necro bump.

Besides the confidence of knowing that you did it and it doesn't have to be done again. Were there any noticeable differences from before to after? Was your diff making noise prior to the service?

m-ys4
02-25-2015, 11:48 AM
when should this be done? how many km/years?

jaehoppa
03-20-2015, 07:48 PM
is this for the s4? IIRC RS4 requires 0.9L?

SprintBlueWorld
03-23-2015, 10:26 AM
Anyone know if the oem drain plug is magnetic?

jakeoboy67
03-23-2015, 02:49 PM
Anyone know if the oem drain plug is magnetic?

I dont recall mine being magnetic or anything(metal shavings) being stuck to it.

daniel B6 1.8t
09-16-2016, 02:15 AM
Just to ,ake sure the center and rear diff for a 5 speed auto TIP use the same 75w-90 oil? I just realized mine hasnt been done and it feels like little slips and heavy when moving... Yes the TRANSMISSION has been changed just 3months old with AUDI'S OEM oil. Just wanna make sure before i buy anything before hand. Thanks

Fourpoint282
01-07-2017, 07:49 PM
DIY: Rear Differential Fluid (http://www.audizine.com/forum/showthread.php/384943-FAQ-Rear-Differential-Fluid-Basics) Change


TOOLS, PARTS, MATERIALS:

~ 3/8 Socket Wrench
~ 3/8 6” Socket Extension
~ 3/8 Swivel-Head Socket Extension
~ 3/8 10mm Hex-Head Socket
~ 3/8 Torque Wrench
~ Fluid Transfer Hand Pump ( I used a cheap 6$ one from Autozone, but something like a Mityvac will save you a few hand cramps)
~ 1.9 Quarts of you favorite 75w90 Gear Oil (Here is a good FAQ to choose one. Thank you dparm (http://www.audizine.com/forum/showthread.php/384943-FAQ-Rear-Differential-Fluid-Basics))
~ A Lift or Jack and Jack Stands
~ Oil Catch Can.
~ Safety Glasses
~ 2 Beer’s

http://i1205.photobucket.com/albums/bb433/david-stg2/Car%20Stuff/IMG_1000000294.jpg
http://i1205.photobucket.com/albums/bb433/david-stg2/Car%20Stuff/IMG_1000000295.jpg
http://i1205.photobucket.com/albums/bb433/david-stg2/Car%20Stuff/IMG_1000000297.jpg
http://i1205.photobucket.com/albums/bb433/david-stg2/43f2f45d.jpg

Note: The following procedure is intended to be a guide only, and was accomplished on a ’04 B6 S4. If followed improperly, damage to you or your property is possible. I take no responsibility for your undertaking of this procedure. Accomplish at your own risk. Remember, Safety first.

DIFFICULTY:

This is extremely easy and can be accomplished by just about anyone who knows what the tools and parts listed above are. Total time for me with a lift was 20 Min. It will take a bit longer if you use a jack and jack stands or wait for the car to cool a little (you do want the oil to be warm thou).


PROCEDURE:




Disconnect the battery.
Beer sip
Set the E-Brake, block the front tires, lift the rear of the car and place on jack stands, remove jack. (Never work under a car supported only by a jack) Alternately and preferably lift the car with a lift.
Beer sip
Place oil catch can under the rear differential.
Beer sip
With a 10mm Hex-Head Socket attached to a swivel and 6” extension, remove the 10mm Hex-Head nut that is towards the top of the right hand side of the differential.
http://i1205.photobucket.com/albums/bb433/david-stg2/Car%20Stuff/IMG_1000000293.jpg
Beer sip
Now remove the 10mm Hex-Head nut on the bottom of the differential and drain all of the old oil.
http://i1205.photobucket.com/albums/bb433/david-stg2/Car%20Stuff/IMG_1000000289.jpg
New beer, beer sip
Reinstall the bottom nut and torque to 30ft lbs (40Nm) (This is what it was for my old car and couldn’t find the torque spec for the S4. will correct if someone posts it up)
Beer sip
Install pump on the quart of oil, install hose into the hole from the removed nut on the top right and pump away.
http://i1205.photobucket.com/albums/bb433/david-stg2/Car%20Stuff/IMG_1000000302.jpg
Beer sip
Add 1.9 Qts of oil, reinstall 10mm nut and torque to 30ft lbs (40Nm) and wipe up any excess drips.
Beer sip
Drop the car, reconnect the battery.
Finish beer.
Properly dispose of your oil and beer cans. Have a good day [wrench]


Nice write up. How often should rear diff fluid be changed?


Sent from my iPad using Audizine (http://r.tapatalk.com/byo?rid=87676)

JayDog747
01-08-2017, 12:41 PM
Gear oil should be changed every 50k.