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Replacing all drivetrain fluids on 4Motion

Raguvian

Go Kart Newbie
Location
Bay Area, CA
Ride
2019 GSW 4MO 6MT
My 4Motion wagon is coming up to 10k miles soon and as preventative maintenance I just wanted to change out all of the fluids to be safe. It might be overkill but better safe than sorry I guess.

So far, I am doing some research and had a few questions and was hoping to get recommendations on what fluids to use.

1. For the transmission, do I need to get the OEM VW stuff? It is close to $30/liter and the car needs 3 bottles.


Would I end up voiding my warranty by putting in something different? Redline MTL is significantly cheaper (although it's 75W80):


Febi is even cheaper:


2. What should I use for the front bevel box and rear differential? VW fluid again is stupid expensive and I would need 1L for each:


Would any regular 75W90 GL5 fluid work?

3. I am going to use the VW fluid for the Haldex swap. I noticed in the Haldex service kit on FCPEuro, they include replacement drain/fill plugs. Do I need those for the transmission, bevel box and differential as well?


Thanks for the help!
 

The Fed

Old Guys Rule
Location
Florida
Unless you're keeping your wagon literally forever you're wasting a lot of money. Don't you have the 6-year warranty? If so, just follow the VW service recommendations, 30K for the Haldex, and whatever VW says for the rest.
 

DiscusInferno

Ready to race!
Location
Kalifornia
Unless you're keeping your wagon literally forever you're wasting a lot of money. Don't you have the 6-year warranty? If so, just follow the VW service recommendations, 30K for the Haldex, and whatever VW says for the rest.
VW says the rest is "lifetime" fluid, but, do you really think gear oil is "lifetime"? While VW service recommendations for the Haldex is a drain and refill, they don't pull the pump and clean the strainer. Would you still trust VW's guidelines 100%?

For the gearbox, VW uses a thin 75W GL-4 gear oil, for improved fuel economy, https://www.fuchs.com/us/en/special/product/product/134237-titan-sintofluid-fe-sae-75w/
But if you use a thicker 75w90 GL-4 gear oil, you might lose some fuel economy. I have used Redline MT-90 before. But new to Redline is https://www.redlineoil.com/mt-lv-70w75w which would work as an OE equivalent.

The front and rear bevel boxes, a GL-5 75w90 is fine (which VW uses https://www.fuchs.com/us/en/special/product/product/11148-titan-sintopoid-sae-75w-90/), but Amsoil Severe Gear 75w90 works fine also.

The Subaru community likes the Redline 75w90 also. https://www.redlineoil.com/75w90-gl-5-gear-oil
 

The Fed

Old Guys Rule
Location
Florida
VW says the rest is "lifetime" fluid, but, do you really think gear oil is "lifetime"? While VW service recommendations for the Haldex is a drain and refill, they don't pull the pump and clean the strainer. Would you still trust VW's guidelines 100%?

For the gearbox, VW uses a thin 75W GL-4 gear oil, for improved fuel economy, https://www.fuchs.com/us/en/special/product/product/134237-titan-sintofluid-fe-sae-75w/
But if you use a thicker 75w90 GL-4 gear oil, you might lose some fuel economy. I have used Redline MT-90 before. But new to Redline is https://www.redlineoil.com/mt-lv-70w75w which would work as an OE equivalent.

The front and rear bevel boxes, a GL-5 75w90 is fine (which VW uses https://www.fuchs.com/us/en/special/product/product/11148-titan-sintopoid-sae-75w-90/), but Amsoil Severe Gear 75w90 works fine also.

The Subaru community likes the Redline 75w90 also. https://www.redlineoil.com/75w90-gl-5-gear-oil
I bought the Fidelity 7-year warranty with zero deductible for a good price ($1548), so to me it doesn't matter. Even changing all of the fluids myself would cost more than that over a 7-year period, and I would not have the added benefits of coverage on everything else. I owned 2 GTI before my R. The cooling fans, door latches, A/C , and automatic transmissions all gave me problems by the time the cars were 7-years old. Cost me a lot more than the extended warranty would have cost. The newer the car, the more electronics they're installing, with more risk of failing. With VW's newest warranty, I probably would just replace the car every 6-years. So much will change I would want a new one anyway.

One other note, where are the drain and fill plugs for the rear differential on AWD cars? VW doesn't list them as a maintenance item?
 

Raguvian

Go Kart Newbie
Location
Bay Area, CA
Ride
2019 GSW 4MO 6MT
Unless you're keeping your wagon literally forever you're wasting a lot of money. Don't you have the 6-year warranty? If so, just follow the VW service recommendations, 30K for the Haldex, and whatever VW says for the rest.
I really do want to keep this car forever considering I can’t get another AWD MT wagon in the future.

Also as a peace of mind thing I like to change out the fluids after the first 10k miles to flush everything out, and then go to factory recommended intervals after that. I’ve seen pictures of the Haldex pump filter after 10k miles and it looks pretty bad.
 
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