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  #13  
Old 05-27-2016, 07:59 PM
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Re: Differential & Xfer Case Fluid Change

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Originally Posted by Treeguy View Post
I decided not to tackle the transmission. At this point I'm taking Jeep at their word that the ZF trans is a lifetime fill.
Always read "Filled for Life" as "Filled for the Life of the Warranty".

If you want to keep your vehicle long term, then the transmission will definitely need changing of oil. If you frequently turn over vehicles, then don't bother.

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  #14  
Old 05-29-2016, 06:10 PM
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Re: Differential & Xfer Case Fluid Change

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Originally Posted by fun2drive View Post
Treeguy
Thanks for the information. I do plan to buy those products as I think I will have no problem if a warranty issue comes up.

For those interested the transmissions in virtually all ZF transmissions are serviced the same way.
Drain the pan. Refill through the fill port until weeping out the fill port. Next start the engine after putting the fill plug in loosely. Run the engine until the trans fluid temperature is between 80-120F open the fill port fill until weeping again then put the plug back in place.
Once you have access to the drain and fill plugs this is about a 30 minutes procedure.
LG8 is a very slippery synthetic that will smell bad. I don't know why but all LG products stink so be forwarned.

Found this I knew I had it somewhere

Here's the response I got from ZF when I asked for confirmation about "lifetime" transmission fluid...

generally we suggest to change the oil between 80.000km and 120.00km. Attached you can find our
official list of lubricants (TE-ML11) with the necessary information about, when to change the oil and
what kind of oil you should use. The second document shows you how to change the oil. But, please
be careful, because you need any kind of tester to read out the temperature while you change the oil.
If the temperature is not correct, you could damage your transmission!
Mit freundlichen Grüßen/Kind regards
-----
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Technische Projekte / Technical Projects

ZF Friedrichshafen AG
Untertürkheimer Straße 4, 66117 Saarbrücken, Deutschland/Germany
Telefon/Phone +
So it appears that I have not done enough reading on the ZF transmissions and will be servicing soon.

Fun 2 Drive, are you saying that a transmission service is simply a drain and refill? On other posts I've read where changing the pan and filter (built in) are mandatory. If so where do you guy the replacement pan?

Thanks
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  #15  
Old 05-30-2016, 07:53 AM
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Re: Differential & Xfer Case Fluid Change

This fill procedure sounds similar to the DSG on the Jetta TDI that we had before the Jeep. I had the Ross-tech vagcom to measure the temperature of the transmission. Is there something similar available for the Jeep?
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  #16  
Old 06-17-2016, 03:38 PM
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Re: Differential & Xfer Case Fluid Change

Yes ZF does not recommend flushing the transmission but draining and refilling. My guess is that steels and clutch material that are sitting someplace doing no harm is dislodged and gets into the check balls which then causes loss of pressure.
All I know is that I just follow their recommendations vs what the vehicle manufacturer suggests and I have never had this cause a problem in the vehicles that I worked on.
Without changes as an anecdote my M3 went 200K miles before the transmission failed. If you don't expect to keep this for a long time then you might just not bother.

Changes at 50K miles will show the LG to be dark brown to black but that is nothing unusual. It still looks fairly clean and with no burning smell but like all ZF LG it stinks...
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  #17  
Old 06-17-2016, 04:01 PM
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Re: Differential & Xfer Case Fluid Change

Just ordered the same MOPAR fluids:
transfer case fluid change I bought 2 qts of Mopar ATF+4 at $12/qt off of Amazon

differentials I bought 3 qts of Mopar Synthetic Axle Lubricant 75w85 at $40/qt off of Amazon. Each diff has a 1.2 qt. capacity.

Looking to pick up a case of LG8 in the next couple months and do all these at the same time. CTSC is where I get all my ZF parts and fluids.

Will report and take pics of how this goes. Might be a waste of time and money this early (50K miles) and I am fine with over servicing my ride...
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  #18  
Old 07-17-2016, 01:11 AM
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Re: Differential & Xfer Case Fluid Change

I ordered the case of Lifeguard 8 from CTSC at $19/quart, with shipping, and did my first drain and refill on the ZF8 transmission yesterday. I have 112,000 miles on my 2014 Turbodiesel and plan to change out the pan/filter at the next change.
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  #19  
Old 07-17-2016, 06:31 AM
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Quote:
Originally Posted by Treeguy View Post
I ordered the case of Lifeguard 8 from CTSC at $19/quart, with shipping, and did my first drain and refill on the ZF8 transmission yesterday. I have 112,000 miles on my 2014 Turbodiesel and plan to change out the pan/filter at the next change.
How did the old fluid look at 112k?
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Old 07-17-2016, 10:37 AM
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Re: Differential & Xfer Case Fluid Change

It was dark. LG8 starts out sort of a golden, slightly gray, color and the 6 liters that drained out were dark brownish gray. I didn't smell anything resembling a burnt smell but I am definitely no judge since this was my first time doing this.
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  #21  
Old 07-17-2016, 10:49 AM
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Re: Differential & Xfer Case Fluid Change

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Originally Posted by Treeguy View Post
It was dark. LG8 starts out sort of a golden, slightly gray, color and the 6 liters that drained out were dark brownish gray. I didn't smell anything resembling a burnt smell but I am definitely no judge since this was my first time doing this.
so you drained it and just put back in the same amount that came out, which was 6L ? Did the jeep have to be running to get it all back in?
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Old 07-17-2016, 11:18 AM
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Quote:
Originally Posted by silvermax04 View Post

so you drained it and just put back in the same amount that came out, which was 6L ? Did the jeep have to be running to get it all back in?
I'm wondering the same. If the first change is as simple as drain and refill with no fluid I'm down. And 6 of a lot better than 9. I'm guessing the other 3 get soaked up in the filter
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  #23  
Old 07-17-2016, 11:46 AM
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Re: Differential & Xfer Case Fluid Change

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Originally Posted by Floridaman View Post
I'm wondering the same. If the first change is as simple as drain and refill with no fluid I'm down. And 6 of a lot better than 9. I'm guessing the other 3 get soaked up in the filter
There will be a little in the filter but the majority of the rest is probably sitting in the torque converter. so you really only get a 66% change out of fluid. what I have done on other vehicles is drain fill then drive it around and drain fill again so in this case you'd be up to an 83% change out with 2 or a 91% with 3. its just that this fluid is so expensive it gets a bit pricey to be doing multi dumpings of fluid.

I will probably do the whole filter pan change out the first time at maybe around 60k miles and then drain and fill the next time. the magnets and filter will probably have the most metal and debris in it the first time just from the new vehicle break in that naturally happens. and then would have lesser at the second change. so I'm thinking fluid and filter pan at 60k and then just a drain and fill at 120k. that should be more than adequate considering they specify this as a fill for life no maintenance trans.

I plan on keeping this jeep for the long term. if I were only going to keep it for 6 or 7 years and 100k I wouldn't even touch the trans fluid.
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Old 07-17-2016, 11:48 AM
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Quote:
Originally Posted by silvermax04 View Post

There will be a little in the filter but the majority of the rest is probably sitting in the torque converter. so you really only get a 66% change out of fluid. what I have done on other vehicles is drain fill then drive it around and drain fill again so in this case you'd be up to an 83% change out with 2 or a 91% with 3. its just that this fluid is so expensive it gets a bit pricey to be doing multi dumpings of fluid.

I will probably do the whole filter pan change out the first time at maybe around 60k miles and then drain and fill the next time. the magnets and filter will probably have the most metal and debris in it the first time just from the new vehicle break in that naturally happens. and then would have lesser at the second change. so I'm thinking fluid and filter pan at 60k and then just a drain and fill at 120k. that should be more than adequate considering they specify this as a fill for life no maintenance trans.

I plan on keeping this jeep for the long term. if I were only going to keep it for 6 or 7 years and 100k I wouldn't even touch the trans fluid.
Is this something you can do yourself? I've done everything myself but this. And I look for any reason to not have to take it to the dealer.
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