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Fuels & Lubricants Discussion all about Fuels & Lubricants. synthetic oil, conventional oil, brands, change intervals, diesel grades, gelling and such debated items like that. Non TDI related postings will be moved or removed. This forum is NOT for the discussion of biodiesel and other alternative fuels.

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Old June 15th, 2006, 13:36   #1
Fortuna Wolf
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Default Differential oil? Changing? What to use?

I tried searching for this. I understand what the transmission is, but what is the differential?
I have a 2002 automatic. Do I have a differential? How do I change the oil in it? Is there a particular standard for this oil that I need to meet, or would a good AMSOIL or Red Line oil work?
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Old June 15th, 2006, 14:54   #2
wny_pat
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You have a transaxle, not a differential. You want the proper VW spec Transmission fluid.
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Old June 15th, 2006, 17:19   #3
Fortuna Wolf
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Fine then, what is the transaxle, how do I change it?
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Old June 15th, 2006, 21:31   #4
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Quote:
Originally Posted by Fortuna Wolf
Fine then, what is the transaxle, how do I change it?
A transaxle is something that has the transmission and the differential in the same case.

Rear wheel drive cars have the differential (which is a case with some gears in it that transfer the rotation of the drive shaft to the drive wheels) on the rear axle, but VWs are front wheel drive and so have the differential and transmission in the same housing, attached to the front axle.

So, 'transaxle' is just another word for your transmission practically speaking.

Edit:
Removed everything I just typed about changing the gear oil, since it applied to manual transmissions, not automatics.
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Last edited by Beowulf; June 15th, 2006 at 21:35.
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Old June 15th, 2006, 23:07   #5
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Ok, so my automatic transmission's differential, automatic transmission, and torque convertor are all in the same case and are all serviced by the same oil and oil reservoir? That's why it takes 9 liters of oil!
So all I have to change is the ATF fluid and I'm done? (And I'll bump up the line pressure too, I've noticed it starting to slip a bit in 1st gear)
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Old June 16th, 2006, 15:01   #6
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You got it. Do a search for the proper ATF, cause I don't have a slush box and don't know what it is. Think you can adjust the auto tranny with the VAG-Com if I remember right. Some of the guys here were talking about something like that, but I don't know if it was the 4sp or Tipomatic.
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Old June 16th, 2006, 15:50   #7
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I have the 4sp. 86k miles, and the clutches are slipping so its due for a fluid change and I'm going to increase the line pressure on it too, but you need to remove the pan to do that. You use vag-com to monitor its temperature and when it gets up to a certain temp is when you top off the fluid.
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Old June 26th, 2006, 14:20   #8
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Quote:
Originally Posted by Fortuna Wolf
I tried searching for this. I understand what the transmission is, but what is the differential?
I have a 2002 automatic. Do I have a differential? How do I change the oil in it? Is there a particular standard for this oil that I need to meet, or would a good AMSOIL or Red Line oil work?
Fortuna,

Check for a separate fill and drain plug on the differential portion of the transaxle. Some transmissions are filled completely with automatic transmission fluid and some are divided into two sections.

I don't know enough about the transmission types used in our cars, so this is collected from different sources. Please verify this before you start draining fluid.

Bentley says the 01M and 096 transmissions are 4-speed automatics, while the 09A/09B are 5-speed automatics.

The data I have says that the 2002 auto transmissions are filled with VW part G052990A2. The final drives (if separate) are filled with 1.7 pints of 75W-90 GL-4 gear lube.

01M initial fill is 3.2 quarts, total fill (torque converter and plumbing) makes it 5.6 quarts.

http://www.bentleypublishers.com/product.htm?code=vya4
http://www.amsoil.com/scripts/runisa...msoiloaf:index

I don't have an owners or service manual for the 2002, so that's all the info I can provide.

Andy
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Old June 26th, 2006, 15:01   #9
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The autos have a seperate differential oil. The service literature goes into detail on how to check and add oil to the differential, but not about draining it. This might be a good use for a suction pump. I dont believe there is a differential drain, but Ive never looked.
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Old June 26th, 2006, 15:15   #10
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Guys, the diff and the trans use a different oil on the automatic. MoGolf says the only way to change the gear oil in the diff is to use a suction device, like a Pella.

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Old June 26th, 2006, 15:24   #11
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Good old blood red Amsoil ATF all the way in the transmission for me.

Kerma line pressure mod at 32 "clicks".

Car is bone stock (for now) but will spin 1st gear if you floor it from a stop on anything less than perfect traction pavement. The shifts are firmer but I have not heard it bark second or anything neck snapping like that.

I drive at WOT (wide open throttle) allot... on a WOT acceleration, if you lift suddenly the car noses over hard like it is downshifting and hunting for gears much lower than your speed would otherwise call for. These shifts on decell feel really harmful so I am avoiding this condition in all but emergency situations by lifting slowly from WOT if I am below 80 mph or so.

In other words don't floor it at 10 mph and spool up the turbo to say 50 mph and then lift your foot off of the throttle suddenly. These particular parameters are not accounted for very well IMHO so I avoid them.

I only got just less than 2 quarts to drain from my trans pan when I did the filter and Kerma mod. After the first refill, I cycled the trans through the gears with the engine running several minutes and drained and filled a second time to get more old VW ATF out and more new Amsoil ATF in. Another drain and fill was repeated a couple of days later as well. I plan to drain and refill every 10k oil change and do a drain, filter and refill every 20k miles.

I always cut trans filters open and look for paper and metal bits... that will tell you much about the condition that your transmission is in!

My 2000 automatic may fail short of my 250k mile goal, but it will go down shifting firmly and will be nice and clean inside when it does give up...

Last edited by LurkerMike; June 26th, 2006 at 15:28.
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Old June 26th, 2006, 16:03   #12
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The original poster asked about the differential, not the transmission.

Drive the vehicle to warm up the fluid.

For the differential fluid you need to remove the speedometer sensor and drive gear. Remove the air cleaner box so you have more room for access down to the sensor/drive gear. You'll need a 24mm socket, IIRC, or use an adjustable wrench. Disconnect the electrical connector and use the wrench to remove the sensor with its drive gear.

Using a suction device like a Pela, suck out the differential fluid. You will want to have driven the vehicle to make this fluid warm or it will be a slow extraction.

Using a long neck funnel pour in .75L of 75W-90 full synthetic gear lube. I use Valvoline and the only place I've found it is at NAPA stores.

Take a look at the speedometer sensor drive gear. The end of it that sticks into the differential has a narrowed tip. The top of the narrowed section is the full mark. The difference between that and the end of the gear is .1L. Wipe off the gear and screw it into the differential, then take it back out to check the level. If overfull, you can use the Pela to extract the extra.

I recommend applying a thin amount of silicone sealant around the "flange" part of the gear the mates flush with the top of the differential case, at the top of the threaded part. If you don't there is a high probability that the fluid you just put in will leak out. (Don't ask how I know.)

Screw in the sensor, reconnect the electrical connector, reinstall the air cleaner box.

Last edited by MOGolf; June 26th, 2006 at 16:06.
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Old June 27th, 2006, 15:50   #13
LurkerMike
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Quote:
Originally Posted by MOGolf
The original poster asked about the differential, not the transmission.
Yes, originally... but then the original poster posted this post that my post was directed at:

Quote:
Originally Posted by Fortuna Wolf
Ok, so my automatic transmission's differential, automatic transmission, and torque convertor are all in the same case and are all serviced by the same oil and oil reservoir? That's why it takes 9 liters of oil!
So all I have to change is the ATF fluid and I'm done? (And I'll bump up the line pressure too, I've noticed it starting to slip a bit in 1st gear)
Fortuna Wolf, you are getting me in trouble with your post drifting!

Otherwise an excellent post MOGolf!

Last edited by LurkerMike; June 27th, 2006 at 15:56.
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Old June 27th, 2006, 18:27   #14
wny_pat
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Quote:
Originally Posted by compu_85
Guys, the diff and the trans use a different oil on the automatic.
Had no idea. That's different.
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Old June 27th, 2006, 18:39   #15
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Quote:
Originally Posted by MOGolf
The original poster asked about the differential, not the transmission.

Drive the vehicle to warm up the fluid.

For the differential fluid you need to remove the speedometer sensor and drive gear. Remove the air cleaner box so you have more room for access down to the sensor/drive gear. You'll need a 24mm socket, IIRC, or use an adjustable wrench. Disconnect the electrical connector and use the wrench to remove the sensor with its drive gear.

Using a suction device like a Pela, suck out the differential fluid. You will want to have driven the vehicle to make this fluid warm or it will be a slow extraction.

Using a long neck funnel pour in .75L of 75W-90 full synthetic gear lube. I use Valvoline and the only place I've found it is at NAPA stores.

Take a look at the speedometer sensor drive gear. The end of it that sticks into the differential has a narrowed tip. The top of the narrowed section is the full mark. The difference between that and the end of the gear is .1L. Wipe off the gear and screw it into the differential, then take it back out to check the level. If overfull, you can use the Pela to extract the extra.

I recommend applying a thin amount of silicone sealant around the "flange" part of the gear the mates flush with the top of the differential case, at the top of the threaded part. If you don't there is a high probability that the fluid you just put in will leak out. (Don't ask how I know.)

Screw in the sensor, reconnect the electrical connector, reinstall the air cleaner box.
Is the fluid suppossed to be GL-5 for the auto differential or GL-4 ?
Never had an auto car but I heard the older VW auto trannies liked to pump the differential with ATF , thin the gear oil and wear it out prematurely. There was a seal there that wasn't doing it's job properly
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