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Re: How To: Reduction Gear Oil Change

Posted: Fri Jun 07, 2019 7:00 am
by powersurge
If is very easy to get the right tranny fluid...

Get a gallon of Valvoline MAXLIFE (RED JUG) mercon dextron AT fluid. It will work on any car any model..

I get it at Walmart,. I use is on all of my 5 cars...

Re: How To: Reduction Gear Oil Change

Posted: Sun Jun 09, 2019 4:46 am
by goldbrick
Goodbar wrote:This isn't new tech, it's what almost every FWD transverse-mounted (which is almost all of them) drivetrain has with an automatic. The B5 Passat is a bit different that most FWD cards in having a longitudinal drivetrain, presumably so that AWD could be offered.


When I was reading up on this I did notice that lots of older cars used AT fluid in the diff. Most of those articles also mentioned that the fluid should be changed every 30k-60k miles. VW claims their transmission fluid is 'lifetime' and never needs to be changed. A company called ZF actually makes the transmissions, though, and I believe they recommend changing the fluid occasionally although that's a bit nebulous since they don't have much official information out there. Since it's a separate hole to change the diff fluid on the VW I just use gear oil for it since that is what is specified by both VW and ZF. Anyway, I sure learned something from this thread. :roll:

Re: How To: Reduction Gear Oil Change

Posted: Sun Jun 09, 2019 12:08 pm
by LeftieBiker
VW claims there transmission fluid is 'lifetime' and never needs to be changed.


Volvo made that claim when the 850 came out, and even omitted the usual drain and fill ports, IIRC. Naturally, a lot of early 850 transmissions have been replaced, and they later came with the usual ports, drains, and service recommendations.

Re: How To: Reduction Gear Oil Change

Posted: Sun Jun 09, 2019 1:42 pm
by goldbrick
There's no fill port on the ZF transmissions either. You have to pump the fluid into the transmission from below. And of course, since it's an AT this has to be done while the pump (ie the engine) is running. :shock: The car has to be level, with the transmission at the correct temperature, etc. It's a major PITA. At least for the diff you just open the plug and fill it until it drains out. Same as most cars I assume.

Re: How To: Reduction Gear Oil Change

Posted: Sun Jun 09, 2019 1:49 pm
by LeftieBiker
The workaround for the 850 was to do a fluid exchange via the lines to the cooler.

Re: How To: Reduction Gear Oil Change

Posted: Sun Jun 09, 2019 7:14 pm
by Nubo
LeftieBiker wrote:
VW claims there transmission fluid is 'lifetime' and never needs to be changed.


Volvo made that claim when the 850 came out, and even omitted the usual drain and fill ports, IIRC. Naturally, a lot of early 850 transmissions have been replaced, and they later came with the usual ports, drains, and service recommendations.


"God help us; we're in the hands of engineers" :lol: