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#4625847 - 01/06/18 11:56 AM Valvoline SynPower limited slip 75w140
double vanos Offline


Registered: 08/05/04
Posts: 1884
Loc: 5600 feet elevation, Arizona
Ramping up to service the rear diff on my Ď11 FX4. Has factory fill in it, 111k miles so itís going to happen real soon. I have Valvoline SynPower LS 75w140 on hand for the job. Will this be high enough quality to replace the original fill Motorcraft stuff? For the price of the Motorcraft stuff it must be good!
I know, I know, I should have done this a long time ago but life keeps getting in the way, I hope I donít have to surrender my bitog card because of my negligence.
Thanks
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#4625877 - 01/06/18 12:15 PM Re: Valvoline SynPower limited slip 75w140 [Re: double vanos]
Snagglefoot Offline


Registered: 12/31/17
Posts: 1713
Loc: Alberta
From the 2011 Ford F-150 owners manual the recommended rear diff fluid is 70-140 synthetic fluid. However, your title of your posting says limited slip. The Synpower will be fine but you need to figure out if you need a friction modifier for the limited slip feature. A GM diff would need this. Any Ford experts out there?

SF

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#4625880 - 01/06/18 12:17 PM Re: Valvoline SynPower limited slip 75w140 [Re: double vanos]
skyactiv Offline


Registered: 03/02/13
Posts: 4394
Loc: The Midwest
I used 75W90 Synpower in the tiny rear end in a WRX I owned. Bought it new, sold with 136K on it. Always used that for the rear end with zero issues.
Used Supertech 75W90 semi synthetic for the five speed manual. The WRX sent 50% of the power to the rear, but also consider a stick is harder on a rear end than a slushbox.
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#4625893 - 01/06/18 12:25 PM Re: Valvoline SynPower limited slip 75w140 [Re: Snagglefoot]
irv Offline


Registered: 10/08/06
Posts: 1059
Loc: Oshawa, Ont. Canada
Originally Posted By: Snagglefoot
From the 2011 Ford F-150 owners manual the recommended rear diff fluid is 70-140 synthetic fluid. However, your title of your posting says limited slip. The Synpower will be fine but you need to figure out if you need a friction modifier for the limited slip feature. A GM diff would need this. Any Ford experts out there?

SF


I believe some diff/gear oils exist where a friction modifier isn't required as there is enough of whatever that good stuff is already in their oil.
I think Mobil is one, but that may depend on what weight it is? I want to try Pennzoil in my diffs but may just use Mobil again if a a friction modifier is req'd?
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#4625972 - 01/06/18 01:15 PM Re: Valvoline SynPower limited slip 75w140 [Re: double vanos]
Snagglefoot Offline


Registered: 12/31/17
Posts: 1713
Loc: Alberta
Just checked the Valvoline website. Both the 70-140 and the 70-90 have the limited slip additive. Check the Valvoline gear oil website to confirm. Iíd stick with your original plan for the 70-140 because itís what Ford recommends. They always use heavier gear oil than the others.

SF

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#4625984 - 01/06/18 01:23 PM Re: Valvoline SynPower limited slip 75w140 [Re: double vanos]
double vanos Offline


Registered: 08/05/04
Posts: 1884
Loc: 5600 feet elevation, Arizona
Thatís what I canít figure out. To lock the diff I have to pull out the knob on the 4WD selector, which makes me think itís just an open rear end until, somehow it gets locked at the pull of the switch. The SynPower bottles says it already has friction modifiers and no additives need to be added, presumably for a clutch pack type of diff. I just want to make sure this stuff will cover the lube requirements of the diff ie itís not a low quality product. It is cheaper than Mobil 1 diff oil.
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Sabine Schmitz is the Queen of the 'Ring; Svetlana Kapanina is the Queen of the SKIES...

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#4626015 - 01/06/18 01:52 PM Re: Valvoline SynPower limited slip 75w140 [Re: double vanos]
Snagglefoot Offline


Registered: 12/31/17
Posts: 1713
Loc: Alberta
Ok, you have the Ford locking differential. This is different from a limited slip differential. Probably need a little more advice on this before you commit.

SF

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#4626057 - 01/06/18 02:41 PM Re: Valvoline SynPower limited slip 75w140 [Re: double vanos]
blupupher Offline


Registered: 08/27/04
Posts: 4421
Loc: Katy, Republic of Texas
If you have the locking diff, no need for additional FM (unless it also has a LS in it as well?).
If you had a limited slip, you would need more FM than what comes in the bottles (the Ford stuff is a great FM, but stinks something horrible)
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1994 Honda VT1100C: Peak 15w-40/TG/2500 mile OCI
2002 Ford F150: GTX HM 5w-20/EcoGard Syn/1yr OCI
2012 Scion xB: QSUD 0w-20/CQ Blue/5k OCI


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#4626068 - 01/06/18 02:52 PM Re: Valvoline SynPower limited slip 75w140 [Re: double vanos]
Snagglefoot Offline


Registered: 12/31/17
Posts: 1713
Loc: Alberta
Try use your VIN to confirm your equipment. The Ford trade name of a limited slip differential for 2011 is Traction-lok or Trac Lok.
It requires 4 oz of Additive Friction Modifier XL-3. This is from page 418 of your owners manual.

What's not clear is if the locking diff is used with the Trac Lok or it it's an open diff when the locking diff is ordered.

Trak Lok and a locking diff are two different things.

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#4626377 - 01/06/18 08:34 PM Re: Valvoline SynPower limited slip 75w140 [Re: double vanos]
69Torino Offline


Registered: 12/12/17
Posts: 237
Loc: Indy
It's very unlikely for the differential to have both a locking mechanism and clutch packs for limited slip operation. Simply not enough room in the carrier. Nevertheless Valvoline SynPower 75-140 is, in my opinion, the very best you can get for a Ford axle. It has perfectly sufficient and effective amounts of friction modifier included, and if it has a mechanical locker, this doesn't even matter.

Ford originally spec'd 80-90 conventional for the diff in my '03 Marauder, and later published a TSB due to "soft axles" failing where the rear axle bearings ride, due to poor heat treating. Mine ate it's axles up at 105k, I put new aftermarket axles and bearings in it, and after a thorough cleaning and inspection replaced the fluid with SynPower 75-140, obeying the TSB. My 3.73 Traction-Lok has been quieter, chatter free and performs flawlessly ever since. I drag race the car a few times a year and beat the snot out of it when I drive it.

In conclusion, I highly recommend SynPower in any Ford axle. This car uses Valvoline Synthetic products exclusively. Not a Valvoline fanboy, just happy with my results. I use Mobil 1 products exclusively in my wife's cars, including gear lube. Her AWD Hyundai Santa Fe has 178k trouble free miles with Mobil 1 in the rear diff and X-fer case. Only because she is a Mobil 1 fan, and stubborn. She's a gear head too. I think her affinity for Mobil 1 comes from being a Mopar girl, and SRT cars are Mobil 1 factory filled. (She's had a couple of Challengers...)


Edited by 69Torino (01/06/18 08:40 PM)
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#4626523 - 01/06/18 11:43 PM Re: Valvoline SynPower limited slip 75w140 [Re: double vanos]
Snagglefoot Offline


Registered: 12/31/17
Posts: 1713
Loc: Alberta
For what itís worth I looked at an owners manual for a 2018 Ford F-150 and both the locking diff and non locking diff took the same synthetic fluid. No mention of friction modifiers. Iíd go ahead with the Syntech 70-140 and not add any friction modifier. You already have some in the fluid and you could always add some if you get chatter.

SF

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#4657402 - 02/05/18 08:17 PM Re: Valvoline SynPower limited slip 75w140 [Re: double vanos]
4WD Offline


Registered: 09/21/10
Posts: 6366
Loc: Texas
Went through this Ö had a quart of MC Ö needed two. It was ridiculous Ö
Mobil 1 was twice as much for 140 -vs- 90 Ö
Came home with Valvoline SynPower Ö(2013 Charger)

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#4659237 - 02/07/18 04:03 PM Re: Valvoline SynPower limited slip 75w140 [Re: Snagglefoot]
BlueOvalFitter Offline


Registered: 02/28/03
Posts: 6003
Loc: Cajun Country, La.
Originally Posted By: Snagglefoot
From the 2011 Ford F-150 owners manual the recommended rear diff fluid is 70-140 synthetic fluid. However, your title of your posting says limited slip. The Synpower will be fine but you need to figure out if you need a friction modifier for the limited slip feature. A GM diff would need this. Any Ford experts out there?

SF

YES! If it's a L/S add the required L/S additive.
How I do it is, add a little bit of the gear fluid then add the additive to said gear lube bottle. Shake it, add to differential. After adding the required lube, take the truck to an empty parking lot and do a series of figure 8's (about 8-10) to circulate the lube/additive.
I have been doing this for YEARS with no problems, YET!
Also, I ALWAYS use a gasket on my differential cover.
A lonnnnnnnnnnng time ago (1987), a tech at ALANS GEAR WORKS (http://www.agearworks.com) told me no matter how much a L/S gear lube bottle reads NO ADDITIVE NEEDED, add it anyway!

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#4659486 - 02/07/18 08:22 PM Re: Valvoline SynPower limited slip 75w140 [Re: BlueOvalFitter]
RyanY Online   content


Registered: 01/25/18
Posts: 83
Loc: South Carolina (SC)

Quote:

A lonnnnnnnnnnng time ago (1987), a tech at ALANS GEAR WORKS (http://www.agearworks.com) told me no matter how much a L/S gear lube bottle reads NO ADDITIVE NEEDED, add it anyway!


This is a safe bet. However, I decided to go with the advice of the Royal Purple rep, who stated that additional LS additive is not required for MaxGear 75w90 in my limited slip cadillac. I was skeptical at first, and cautiously tested it by slowly making sharp turns in a parking lot. No issues then, or in the 2 yrs since.
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2007 Cadillac CTS 3.6L (Pennzoil Platinum HM 5W-30) >115k

2012 Honda Odyssey EX-L (Valvoline Synthetic Maxlife 0W-20) >83k

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