transfer case oil. xl-12??? - Page 3 - Ford Powerstroke Diesel Forum
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post #21 of 28 Old 07-01-2019, 09:24 AM
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thanks !! ...

6.0 flush pdf
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post #22 of 28 Old 07-01-2019, 10:25 AM
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I am not trying to argue with you.
I just pulled that from Identa-fix Specs chart. So my train of thought is anything DEXIII/MERCON or newer will be just fine.
Newer fluids usually have additional additives in them and are MOST of the time backwards compatible because they are replacing another fluid. Or they changed additives to, not sludge, stop shudder, be more electronics & wiring friendly and I am sure some other reasons I have no clue about.
But we are talking about a transfer case so the electronics and shudder shouldn't be an issue.
I use synthetic oils in everything on my vehicles but thats my personal preference.
I will shut up now.😊
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post #23 of 28 Old 07-01-2019, 10:43 AM
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FWIW Mercon V says right on the bottle do not use in transfer cases so all ATFs are not created equal

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post #24 of 28 Old 07-01-2019, 12:03 PM
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no one is arguing IMO just discussing

Mercon LV is not new so it did not supersede xl12
they must have determined a need to change the spec away from xl12

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post #25 of 28 Old 07-01-2019, 06:27 PM
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Quote:
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no one is arguing IMO just discussing

Mercon LV is not new so it did not supersede xl12
they must have determined a need to change the spec away from xl12
Not necessarily, it very well could have been a bean counter move. Less stock numbers.
Ford T-cases have been using Mercon, then XL12 for years without issue. The first time problems showed up was when they went from Mercon to Mercon V and started having T-case failures. Hence the note on the Mercon V bottle and the addition of XL-12. I'll bet they did some minimal testing and determined that LV didn't blow up T-cases so there it is, no more XL-12.
FWIW I have two bottles of XL-12 and two of the Valvoline equivalent on the shelf, guess what's going in my truck when I get around to changing the fluid?
It wouldn't be the first time the bean counters gave us crap so they'd have less stock numbers. Can you say Ford Gold?

I just read where they say do not use XL-12 in T-cases that call for Mercon LV, so there is a compatibility issue. So if you do plan on running LV in an 1980 - 2016 transfer case you may want to flush as much of the old Mercon/XL-12/DexMerc out before adding LV.
https://torqueking.com/product/737/1...er-case-fluid/

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post #26 of 28 Old 07-01-2019, 06:47 PM
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More info or just confusion?
Motorcraft.com will say that LV is not for use in T case.
T case fluid just a modified bean to count?
FWIW, I used Full Synthetic Valvoline T case fluid in my recent change.
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post #27 of 28 Old 07-02-2019, 12:34 PM
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More info or just confusion?
Motorcraft.com will say that LV is not for use in T case.
T case fluid just a modified bean to count?
FWIW, I used Full Synthetic Valvoline T case fluid in my recent change.
This says it is for T Cases. Lol.

https://www.fcsdchemicalsandlubrican...ission%20Fluid
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post #28 of 28 Old 07-02-2019, 12:48 PM
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Well I mix a stout beer, honey and some used motor oil for my transfer case!

Sorry Just had to get my two cents in while I could.

Ford has been back and forward with transfer case fluid. Look at your owns manual (available free online) and find the closest fluid that's compatible. Ford will again in a few years say use X and not Y again anyways.

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