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#4682417 - 03/02/18 03:08 PM Amsoil vs Motorcraft gear oil
Whimsey Offline


Registered: 12/22/02
Posts: 4050
Loc: The Garden State
We have a 2017 4WD 2.3 EB Explorer. We intend to keep it 10+ years as we do all our vehicles. The PTU, Ford's new style transfer case, requires synthetic 75W-140 gear oil and the RDU, rear differential specs 80W-90 non synthetic gear oil. Both are Motorcraft gear oils and both are "Life Time" fills supposedly. From what I've seen the PTU can turn the Motorcraft synthetic 75W-140 into black cake in as little as 30,000 miles or less rendering the PTU unit useless and broken. For long term life I've always changed the rear diff in the past, at least by 30,000 miles with synthetic gear oil. I'm wondering whether Amsoil's Severe Gear 75W-140 for the PTU and 75w-90 gear oil would be more beneficial than the Motorcraft gear oils spec'd. For the rear diff I can use Amsoil 80W-90 synthetic gear oil also if the Severe Gear 75W-90 is not appropriate. Thanks!

Whimsey

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#4682448 - 03/02/18 03:51 PM Re: Amsoil vs Motorcraft gear oil [Re: Whimsey]
MolaKule Offline


Registered: 06/05/02
Posts: 19042
Loc: Iowegia - USA
Heat and low oil capacity of the PTU really thrashes the oil.

I would recommend the Amsoil SG 75W140 for the PTU and the SG 75W90 for the rear differential.

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#4682500 - 03/02/18 04:48 PM Re: Amsoil vs Motorcraft gear oil [Re: MolaKule]
Whimsey Offline


Registered: 12/22/02
Posts: 4050
Loc: The Garden State
Originally Posted By: MolaKule
Heat and low oil capacity of the PTU really thrashes the oil.

I would recommend the Amsoil SG 75W140 for the PTU and the SG 75W90 for the rear differential.


Thanks MolaKule! I've respected your opinion for 15+ years and continue to do so. Many thanks for all your help and knowledge over all these years.

Whimsey

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#4682561 - 03/02/18 05:39 PM Re: Amsoil vs Motorcraft gear oil [Re: MolaKule]
donnyj08 Offline


Registered: 08/12/12
Posts: 3034
Loc: Cincinnati
Originally Posted By: MolaKule
Heat and low oil capacity of the PTU really thrashes the oil.

I would recommend the Amsoil SG 75W140 for the PTU and the SG 75W90 for the rear differential.


What he said ^ if you have warranty concerns use the above grades in the Motorcraft oil.

If it were mine id change the PTU fluid annually NTE 25k miles.


Edited by donnyj08 (03/02/18 05:40 PM)
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#4682679 - 03/02/18 07:54 PM Re: Amsoil vs Motorcraft gear oil [Re: Whimsey]
benjy Offline


Registered: 08/23/10
Posts: 874
Loc: pa
the amsoil is likely better, but Redline lubricants are even better IMO! Amsoil products are only as good as needed as they answer NOTHING about their formulations + only say they meet or exceed the OE. they quit blowing their PAO horn some time ago + are likely formulating better than average but not as good as before products IMO!!

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#4682689 - 03/02/18 08:08 PM Re: Amsoil vs Motorcraft gear oil [Re: MolaKule]
Pajero Offline


Registered: 05/05/12
Posts: 875
Loc: Rio Rancho, NM
Originally Posted By: MolaKule
Heat and low oil capacity of the PTU really thrashes the oil.

I would recommend the Amsoil SG 75W140 for the PTU and the SG 75W90 for the rear differential.


Doctor knows best! Amsoil makes great Gear lube, just bought a bunch from Pablo here on BITOG. When people with experience and PHD's make recommendations, I'm all ears!

*I don't know Pablo, only from these forums.....I don't sell Amsoil either... OP please read my signature.


Respectfully,

Pajero!
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#4682742 - 03/02/18 08:56 PM Re: Amsoil vs Motorcraft gear oil [Re: Whimsey]
aquariuscsm Online   content


Registered: 12/30/06
Posts: 18182
Loc: Dallas,Tx USA
Amsoil Severe Gear,end thread.
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#4683017 - 03/03/18 08:32 AM Re: Amsoil vs Motorcraft gear oil [Re: Whimsey]
zeng Offline


Registered: 09/01/15
Posts: 2189
Loc: Malaysia
Originally Posted By: Whimsey
I'm wondering whether Amsoil's Severe Gear 75W-140 for the PTU and 75w-90 gear oil would be more beneficial than the Motorcraft gear oils spec'd. For the rear diff I can use Amsoil 80W-90 synthetic gear oil also if the Severe Gear 75W-90 is not appropriate. Thanks!

A differential mineral 80W90 typically has a [email protected]*C of 135-165 cSt, i.e an ISO 150 gear oil grade.
Now I would speculate a Ford mineral 80W90 has a [email protected]*C of about 146 cSt.
Amsoil SS 75W90 has a [email protected]*C that is too low at 102.4 cSt, falling into (lower) ISO 100 grade.
Amsoil synthetic 80W90 has a [email protected]*C of 120.2 cSt, which is in between ISO 100 and ISO 150 gradings.
If you must replace Ford differential mineral 80W90 with an Amsoil, I would recommend Amsoil SS 75W110 that has a [email protected]*C of 139.9 cSt which matches an ISO 150 gear oil grade.

Amsoil 75W140 should be an equivalent replacement for Ford 75W140 in a PTU.JMHO

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#4683082 - 03/03/18 10:01 AM Re: Amsoil vs Motorcraft gear oil [Re: Whimsey]
Linctex Offline


Registered: 12/31/16
Posts: 6178
Loc: Waco, TX
Originally Posted By: Whimsey
From what I've seen the PTU can turn the Motorcraft synthetic 75W-140 into black cake in as little as 30,000 miles or less rendering the PTU unit useless and broken.


WOW!!

Change it at 15,000, then at 20,000, then 25,000 - to see how yours behaves.

I wouldn't take chances
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#4683134 - 03/03/18 10:53 AM Re: Amsoil vs Motorcraft gear oil [Re: Linctex]
Whimsey Offline


Registered: 12/22/02
Posts: 4050
Loc: The Garden State
Originally Posted By: Linctex
Originally Posted By: Whimsey
From what I've seen the PTU can turn the Motorcraft synthetic 75W-140 into black cake in as little as 30,000 miles or less rendering the PTU unit useless and broken.


WOW!!

Change it at 15,000, then at 20,000, then 25,000 - to see how yours behaves.

I wouldn't take chances

I had the dealer change it at 9,000 miles, of course they used Motorcraft 75W-140. My next change will be at approx 25,000 mi using the Amsoil SG 75W-140. Then I'll do it again at approx 50,000 miles to see how the Amsoil SG holds up and then decide on the change frequency. And Ford calls this a "lifetime fill" in the PTU mad.

Whimsey


Edited by Whimsey (03/03/18 10:56 AM)

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#4683171 - 03/03/18 11:44 AM Re: Amsoil vs Motorcraft gear oil [Re: Whimsey]
4WD Offline


Registered: 09/21/10
Posts: 6424
Loc: Texas
Originally Posted By: Whimsey
Originally Posted By: Linctex
Originally Posted By: Whimsey
From what I've seen the PTU can turn the Motorcraft synthetic 75W-140 into black cake in as little as 30,000 miles or less rendering the PTU unit useless and broken.


WOW!!

Change it at 15,000, then at 20,000, then 25,000 - to see how yours behaves.

I wouldn't take chances

I had the dealer change it at 9,000 miles, of course they used Motorcraft 75W-140. My next change will be at approx 25,000 mi using the Amsoil SG 75W-140. Then I'll do it again at approx 50,000 miles to see how the Amsoil SG holds up and then decide on the change frequency. And Ford calls this a "lifetime fill" in the PTU mad.

Whimsey


Do you have room for a Fumoto valve… figured you could drain and then batch inject with super syringe …
Has to be better than gurgling a 1/4” air hose … but that hose would easily facilitate the above (ventilation)
It would require the ‘N’ valve to stick hose on …

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#4683251 - 03/03/18 02:00 PM Re: Amsoil vs Motorcraft gear oil [Re: 4WD]
Whimsey Offline


Registered: 12/22/02
Posts: 4050
Loc: The Garden State
Thanks for the suggestion. Next time I'm under the Explorer I'll take a look and see if this is feasible. Of course the snow and ice have to melt before I do that LOL.

Whimsey

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#4683588 - 03/03/18 07:53 PM Re: Amsoil vs Motorcraft gear oil [Re: Whimsey]
threeputtpar Offline


Registered: 08/04/11
Posts: 2089
Loc: Appleton, WI
I had a 2008 Taurus X AWD and had to deal with a gunked up PTU. I realize that yours is far newer and probably in decent shape, but I think my recommendation still holds water.

I used Schaeffer's 75W-140 meant for Harley motorcycle gear cases. From my research I thought it was the best available option to withstand the heat of the catalytic converter 4 inches away, plus I had a distributor 15 minutes away from me that kept it in stock for $15/quart.

I also drill and tapped a drain plug in the PTU to make the changes far easier (I think I posted here on the Edge forum). Even with a fluid extractor and a small rigid tube it was very difficult to get any of the old gear oil out. Some Edge owner even fabricated a heat shield to help dissipate heat.
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2005 Audi allroad - PP Euro 0W-40 / Carquest Blue 212k miles

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#4689340 - 03/09/18 06:36 AM Re: Amsoil vs Motorcraft gear oil [Re: Whimsey]
Drew2000 Offline


Registered: 11/16/06
Posts: 1014
Loc: Long Island, NY
How does Mobil 1 75w140 compare to the other brands? I have a quart and plan on using this in the PTU next oil change.
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#4689509 - 03/09/18 10:54 AM Re: Amsoil vs Motorcraft gear oil [Re: Drew2000]
Whimsey Offline


Registered: 12/22/02
Posts: 4050
Loc: The Garden State
Originally Posted By: Drew2000
How does Mobil 1 75w140 compare to the other brands? I have a quart and plan on using this in the PTU next oil change.


It won't do any worse than the Motorcraft 75W-140 that Ford uses. In fact it may hold upper better because it probably has PAO in it and not just Group lll as the Motorcraft probably is made of. Nothing wrong with Motorcraft 75W-140 in their rear diffs of their trucks, it held up well for me and so did Mobil1 75W-140. The "uniqueness" of the PTU and it's location necessitates a real stout 75W-140. Have you changed your PTU before and do you have any helpful suggestions? Thanks.

Whimsey


Edited by Whimsey (03/09/18 10:55 AM)

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