Type of fluid for front diff?

[beebon619]

What type of fluid am I suppose to use for the front diff on a 2017 S3?

[noseyp]

What type of fluid am I suppose to use for the front diff on a 2017 S3?

For my 2015 S3 I used G052145S2 which is 75W90 synthetic gear oil. I bought it here:

https://www.ecstuning.com/b-genuine-...ter/g052145s2/

Helpful guide below. Might as well change the rear diff fluid as well. I bought three liters for both because I think front or rear requires a little over a liter.

https://www.audi-sport.net/xf/thread...change.384151/

[Spinnetti]

What's the service interval on the diff fluid? I'm probably due also. I've been a fan of Redline synthetics for my stuff. My Touareg had lifetime fill on the trans, and I decided to change it after 220,000 miles and 14 years, and it looked brand new still - they weren't kidding about lifetime fill!

[MikTip]

What's the service interval on the diff fluid? I'm probably due also. I've been a fan of Redline synthetics for my stuff. My Touareg had lifetime fill on the trans, and I decided to change it after 220,000 miles and 14 years, and it looked brand new still - they weren't kidding about lifetime fill!

There is no VW/Audi interval specified...however the bevel box suffers from the old evaporating diff oil issue of older Audi's as its vented to atmosphere...



I changed my bevel box oil(aka front diff) not to be confused with the DSG gears...and its less than 1 quart of 75w-90 looked darker then new...seems it generates some heat...is air cooled...sits directly behind the engine...not sure really if it gets any cooling air...as you can see the cooling fins pictured above...

https://www.vwvortex.com/threads/min...using.7615825/

My bevel box gears started to make noise...gear noise...whine...so I added this:



Noise deminished.

https://www.audizine.com/forum/showt...ation-2016-RS3

What's important to note is don't fill the wrong part with the wrong oil. Especially the Haldex. Make certain in the differential part of the Haldex thats getting the 75w-90.

Same with the DSG. It does not get any 75w-90.

Guy over on the RS3 forums put 75w-90 in his Haldex...required new Haldex...then he blamed ECS for selling him the wrong oil! Dont be that guy!

[beebon619]

There is no VW/Audi interval specified...however the bevel box suffers from the old evaporating diff oil issue of older Audi's as its vented to atmosphere...



I changed my bevel box(aka front dif) not to be confused with the DSG gears...and its less than 1 quart of 75w-90 looked darker then new...seems it generates some heat...is air cooled...sits directly behind the engine...not sure really if it gets any cooling air...as you can see the cooling fins pictured above...

https://www.vwvortex.com/threads/min...using.7615825/

My bevel box gears started to make noise...gear noise...whine...so I added this:



Noise deminished.

https://www.audizine.com/forum/showt...ation-2016-RS3

What's important to note is don't fill the wrong part with the wrong oil. Especially the Haldex. Make certain in the differential part of the Haldex thats getting the 75w-90.

Same with the DSG. It does not get any 75w-90.

Guy over on the RS3 forums put 75w-90 in his Haldex...required new Haldex...then he blamed ECS for selling him the wrong oil! Dont be that guy!

Thanks for your insight. Could I use this fluid? https://www.autozone.com/greases-and..._0?spps.s=4027

[MikTip]

Thanks for your insight. Could I use this fluid? https://www.autozone.com/greases-and..._0?spps.s=4027

Im not sure about the LS limited slip additive...

[MikTip]

[noseyp]

I had a shop change both the front and rear diff fluid at 80k miles / 7 years even though they are technically life time fluids. Shop said front fluid was dark and seemed like a change was a good idea. They said the rear fluid looked fine though.

[beebon619]

Im not sure about the LS limited slip additive...

I’ll probably just buy the OEM fluid then.

[MikTip]

I’ll probably just buy the OEM fluid then.

I use the Liqui moly...

Its German. VW 501 50



https://products.liqui-moly.us/high-...-75w-90-2.html

[Spinnetti]

Hmm. given how hard I drive it.. looks like I should change the front bevel box aka PTO lol.

[beebon619]

Hmm. given how hard I drive it.. looks like I should change the front bevel box aka PTO lol.

76K on my vehicle and I don't know if the fluids were changed

[AudiGeo]

Are there any tutorials for the front bevel box fluid change? I can find the Haldex and rear diff videos, but nothing for the front...

[AudiGeo]

These might help everyone for the front diff...

FDIFF1.jpgFDIFF2.jpgFDIFF3.jpgFDIFF4.jpgFDIFF5.jpg

[AudiGeo]

There is no VW/Audi interval specified...however the bevel box suffers from the old evaporating diff oil issue of older Audi's as its vented to atmosphere...



I changed my bevel box(aka front dif) not to be confused with the DSG gears...and its less than 1 quart of 75w-90 looked darker then new...seems it generates some heat...is air cooled...sits directly behind the engine...not sure really if it gets any cooling air...as you can see the cooling fins pictured above...

https://www.vwvortex.com/threads/min...using.7615825/

My bevel box gears started to make noise...gear noise...whine...so I added this:



Noise deminished.

https://www.audizine.com/forum/showt...ation-2016-RS3

What's important to note is don't fill the wrong part with the wrong oil. Especially the Haldex. Make certain in the differential part of the Haldex thats getting the 75w-90.

Same with the DSG. It does not get any 75w-90.

Guy over on the RS3 forums put 75w-90 in his Haldex...required new Haldex...then he blamed ECS for selling him the wrong oil! Dont be that guy!

Did you do a complete front diff oil swap and then add the entire contents, or did you just open up the fill port and squeeze this in?

[MikTip]

Did you do a complete front diff oil swap and then add the entire contents, or did you just open up the fill port and squeeze this in?

At 70,000 I drained the bevel box...to see the condition of the oil...it was darker in color than new oil...filled with new oil.

At 100,000 I drained the bevel box oil again. Same darker color...

I also had some gear whine from the bevel box...so I added the MoS2 with the new oil at 100k.

I now have 170,000

The rear diff oil looked good the two times I changed it before adding the MoS2.

[AudiGeo]

At 70,000 I drained the bevel box...to see the condition of the oil...it was darker in color than new oil...filled with new oil.

At 100,000 I drained the bevel box oil again. Same darker color...

I also had some gear whine from the bevel box...so I added the MoS2 with the new oil at 100k.

I now have 170,000

The rear diff oil looked good the two times I changed it before adding the MoS2.

Great thanks for clarifying.


2018 Audi S3 8V - EQT Stage 1 E85 OTS - EQT DSG Tune - MBRP Catback Exhaust - APR CAI - ECS Intake Hose - Leyo TIP - EQT HPFP

[AudiGeo]

At 70,000 I drained the bevel box...to see the condition of the oil...it was darker in color than new oil...filled with new oil.

At 100,000 I drained the bevel box oil again. Same darker color...

I also had some gear whine from the bevel box...so I added the MoS2 with the new oil at 100k.

I now have 170,000

The rear diff oil looked good the two times I changed it before adding the MoS2.

When you did the front diff, did you have trouble accessing the fill port? Did you remove the heat shield or were you able to get around it?

[MikTip]

When you did the front diff, did you have trouble accessing the fill port? Did you remove the heat shield or were you able to get around it?

First time...removed heat shield...working thru right front wheel well...wheel and tire removed. 1/4 drive couple long extensions...

Found a hose that fit inside the tiny fill port and a large syringe...



Used metric allen wrench ball end socket...

[AudiGeo]

First time...removed heat shield...working thru right front wheel well...wheel and tire removed. 1/4 drive couple long extensions...

Found a hose that fit inside the tiny fill port and a large syringe...



Used metric allen wrench ball end socket...

Awesome thanks. I found a good video. He's working on a Golf R but should be pretty similar for the S3

https://www.youtube.com/watch?v=FWQnlBpgnI8

[AudiGeo]

I ordered the items for this service. If anyone needs part numbers, see screenshot below:

DIFFPARTS.jpg

[AudiGeo]

This also may come in handy when filling the bevel box. Not sure if anyone has used it, but I might give it a try...

https://www.amazon.com/dp/B07HB21V75...ing=UTF8&psc=1

[beebon619]

I use the Liqui moly...

Its German. VW 501 50



https://products.liqui-moly.us/high-...-75w-90-2.html

Purchased 2 bottles. Is the rear diff the same fluid as the front bevel box? Planning to service the Haldex soon. I got quoted $280 including parts & labor for the rear + haldex from an indy.

[MikTip]

This also may come in handy when filling the bevel box. Not sure if anyone has used it, but I might give it a try...

https://www.amazon.com/dp/B07HB21V75...ing=UTF8&psc=1

I have these:



https://www.amazon.com/dp/B09C5LRGF9...ZTM8XE67HVYS4F

Dont use them...the hose and syringe I like the best.

[MikTip]

Purchased 2 bottles. Is the rear diff the same fluid as the front bevel box? Planning to service the Haldex soon. I got quoted $280 including parts & labor for the rear + haldex from an indy.

The rear diff same yes. Make sure its the diff section and not the Haldex section.

https://www.audizine.com/forum/showt...1#post14777236