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Synthetic differential fluid - 2 questions? #4573801
11/14/17 01:15 PM
11/14/17 01:15 PM
Joined: Aug 2014
Posts: 326
Florida
lawnguy Offline OP
lawnguy  Offline OP
Joined: Aug 2014
Posts: 326
Florida
My vehicle - 2000 Ford F150 4x2 4.6V8

1) Is this what I should use? Synthetic Gear Lubricant, SAE Grade 75W-90

2) Is O'Reily brand "synthetic just as good as Mobil 1 ?

Re: Synthetic differential fluid - 2 questions? [Re: lawnguy] #4573816
11/14/17 01:34 PM
11/14/17 01:34 PM
Joined: May 2005
Posts: 10,546
ROCHESTER, NY
Char Baby Offline
Char Baby  Offline
Joined: May 2005
Posts: 10,546
ROCHESTER, NY
I am unaware of any conventional gear lube that is 75w90... only synthetics in that grade. My only concern would be whether your diff has limited slip therefore you would need to purchase a seperate LS additive or buy the gear lube with it already in there in which the bottle will say so.


"Retired"
-----------------------------------

'80 Firebird FORMULA V8/4bbl-purchased "NEW"
'15 Nissan Altima 2.5 SV
'15 Honda Civic LX
Re: Synthetic differential fluid - 2 questions? [Re: lawnguy] #4573820
11/14/17 01:39 PM
11/14/17 01:39 PM
Joined: Sep 2010
Posts: 7,594
Planet Earth
2015_PSD Offline
2015_PSD  Offline
Joined: Sep 2010
Posts: 7,594
Planet Earth
According to what I see in the 2000 Ford F-150 Owner's Manual, your rear axle should use 75W-140 which is definitely a synthetic gear oil. IMHO Amsoil is the best, but M1, SuperTech, Castrol or the like would be just fine (need to check on the LS additive as CharBaby suggested though).

Re: Synthetic differential fluid - 2 questions? [Re: lawnguy] #4573829
11/14/17 01:57 PM
11/14/17 01:57 PM
Joined: Sep 2010
Posts: 7,485
S California
OneEyeJack Offline
OneEyeJack  Offline
Joined: Sep 2010
Posts: 7,485
S California
You might also consider Red Line.

Re: Synthetic differential fluid - 2 questions? [Re: 2015_PSD] #4573834
11/14/17 02:03 PM
11/14/17 02:03 PM
Joined: Feb 2010
Posts: 1,623
Imperial Valley, California
Jeffs2006EvoIX Offline
Jeffs2006EvoIX  Offline
Joined: Feb 2010
Posts: 1,623
Imperial Valley, California
Originally Posted By: 2015_PSD
According to what I see in the 2000 Ford F-150 Owner's Manual, your rear axle should use 75W-140 which is definitely a synthetic gear oil. IMHO Amsoil is the best, but M1, SuperTech, Castrol or the like would be just fine (need to check on the LS additive as CharBaby suggested though).


Cant stand it when folks say "this is the best" There is no "Best" haha. Amsoil is as good as many other products out there and people on these forums know this. So lets keep brand Bias out of it.

OP,

As long as you follow Fords Recommendations of what gear oil to use, you are fine. Just check your manual to verify, and buy a brand you have heard of. If you are not sure who makes O'Riley Oil? Then buy something else that you have heard of, or at least know who made it.

Good Luck thumbsup


Truck On!!


Jeff


"You don't have to be crazy to do this... But it helps." Bob Ross.
Re: Synthetic differential fluid - 2 questions? [Re: Jeffs2006EvoIX] #4573842
11/14/17 02:13 PM
11/14/17 02:13 PM
Joined: Sep 2010
Posts: 7,594
Planet Earth
2015_PSD Offline
2015_PSD  Offline
Joined: Sep 2010
Posts: 7,594
Planet Earth
Originally Posted By: Jeffs2006EvoIX
Originally Posted By: 2015_PSD
According to what I see in the 2000 Ford F-150 Owner's Manual, your rear axle should use 75W-140 which is definitely a synthetic gear oil. IMHO Amsoil is the best, but M1, SuperTech, Castrol or the like would be just fine (need to check on the LS additive as CharBaby suggested though).
Cant stand it when folks say "this is the best" There is no "Best" haha. Amsoil is as good as many other products out there and people on these forums know this. So lets keep brand Bias out of it.
If you can read, you will see that I clearly said IMHO, which means In My Humble Opinion and I clearly noted other brands as well. No one is forcing you to accept my opinion, so climb down off that ivory tower.

Re: Synthetic differential fluid - 2 questions? [Re: lawnguy] #4573858
11/14/17 02:30 PM
11/14/17 02:30 PM
Joined: Aug 2014
Posts: 326
Florida
lawnguy Offline OP
lawnguy  Offline OP
Joined: Aug 2014
Posts: 326
Florida
If I gave my VIN# to my local ford parts dept could they tell me if my truck is Limited slip?

Re: Synthetic differential fluid - 2 questions? [Re: lawnguy] #4573868
11/14/17 02:50 PM
11/14/17 02:50 PM
Joined: Sep 2010
Posts: 7,594
Planet Earth
2015_PSD Offline
2015_PSD  Offline
Joined: Sep 2010
Posts: 7,594
Planet Earth
Originally Posted By: lawnguy
If I gave my VIN# to my local ford parts dept could they tell me if my truck is Limited slip?
I would think so. BDCardinal on here can probably tell you as well (he is a Ford parts advisor and an all around great guy).

Re: Synthetic differential fluid - 2 questions? [Re: lawnguy] #4573878
11/14/17 03:04 PM
11/14/17 03:04 PM
Joined: Aug 2014
Posts: 326
Florida
lawnguy Offline OP
lawnguy  Offline OP
Joined: Aug 2014
Posts: 326
Florida
I just called my local ford dealer parts dept. I gave them the last 8 of my vin. He told my my truck had a limited slip,and the rec diff fluid is 75w 140

Re: Synthetic differential fluid - 2 questions? [Re: lawnguy] #4573886
11/14/17 03:12 PM
11/14/17 03:12 PM
Joined: Sep 2010
Posts: 7,594
Planet Earth
2015_PSD Offline
2015_PSD  Offline
Joined: Sep 2010
Posts: 7,594
Planet Earth
Originally Posted By: lawnguy
I just called my local ford dealer parts dept. I gave them the last 8 of my vin. He told my my truck had a limited slip,and the rec diff fluid is 75w 140
Just need to find gear oil that already has the LS additive in it or purchase a bottle of it and add it to the axle after filling it. Ford sells it (For a complete drain and refill, some limited-slip axles require addition of Friction Modifier, Part Number XL-3 meeting Ford specification EST-M2C118-A).

Re: Synthetic differential fluid - 2 questions? [Re: 2015_PSD] #4573898
11/14/17 03:22 PM
11/14/17 03:22 PM
Joined: Feb 2010
Posts: 1,623
Imperial Valley, California
Jeffs2006EvoIX Offline
Jeffs2006EvoIX  Offline
Joined: Feb 2010
Posts: 1,623
Imperial Valley, California
Originally Posted By: 2015_PSD
Originally Posted By: Jeffs2006EvoIX
Originally Posted By: 2015_PSD
According to what I see in the 2000 Ford F-150 Owner's Manual, your rear axle should use 75W-140 which is definitely a synthetic gear oil. IMHO Amsoil is the best, but M1, SuperTech, Castrol or the like would be just fine (need to check on the LS additive as CharBaby suggested though).
Cant stand it when folks say "this is the best" There is no "Best" haha. Amsoil is as good as many other products out there and people on these forums know this. So lets keep brand Bias out of it.
If you can read, you will see that I clearly said IMHO, which means In My Humble Opinion and I clearly noted other brands as well. No one is forcing you to accept my opinion, so climb down off that ivory tower.


Yes I did read that. But you still said "the Best" regardless. At any point anyone says something is "Best" is an opinion so you basically just repeated yourself.

There is no Ivory Tower, unless you placed me on one.

Maybe just say you like Amsoil, give it a try, rather than "IMHO ITS THE BEST" mmmmmm But thats just me.


Jeff


"You don't have to be crazy to do this... But it helps." Bob Ross.
Re: Synthetic differential fluid - 2 questions? [Re: lawnguy] #4573908
11/14/17 03:29 PM
11/14/17 03:29 PM
Joined: Jun 2012
Posts: 1,757
USA
oldhp Offline
oldhp  Offline
Joined: Jun 2012
Posts: 1,757
USA
I just put Valvoline Synthetic( it says for limited slip on the bottle) 75W90 in my 2017 Jeep w/trac lock differential on a 1000 mile round trip. Rear diff is quiet as a church mouse.


2018 RAM 1500 3.6/8 speed.
2017 Jeep Sahara Unlimited 3.6
"U kan't fixe it......if'n it ain't broke."
Re: Synthetic differential fluid - 2 questions? [Re: lawnguy] #4573920
11/14/17 03:38 PM
11/14/17 03:38 PM
Joined: Feb 2007
Posts: 3,698
Southeast
meep Offline
meep  Offline
Joined: Feb 2007
Posts: 3,698
Southeast
From a "risk" standpoint, the LSD additive is the more important thing here. Not enough, or the wrong kind, and the clutches will wear prematurely.

I'm not sure of OEM/dealer fluids, but I find with every aftermarket diff goop in an LSD, the "includes Limitied slip Modifier" is never right. Usually not enough, even with amsoil. I use amsoil and find that their fluid, plus about 1/3 of a tube of their LSD modifier, is about right in my tundra.

We tow a TT on the interstate, and the diff gets plenty hot on hill climbs. I'm a fan for synth in the driveline.

-m


2018 F150
2015 crv (wifey!)
Re: Synthetic differential fluid - 2 questions? [Re: lawnguy] #4573982
11/14/17 04:47 PM
11/14/17 04:47 PM
Joined: Oct 2004
Posts: 8,297
Cincinnati, OH, USA
bullwinkle Offline
bullwinkle  Offline
Joined: Oct 2004
Posts: 8,297
Cincinnati, OH, USA
If you're going to work it, Royal Purple Severe Gear full syn gear oil is pretty hard to beat. Now if you're just putting around empty, just about any decent 75W140 with LSD additive would be more than enough.


06 Ram 3500 CTD 4X4(FG Venturi), 93 GMC C3500 6.2, 89 F-450 7.3, 98 XJ 4.0(XG8A), 05 xB(XG3600), 18 Transit 3.7, 03 Merc Grand Marquis 4.6 2V(XG2)
Re: Synthetic differential fluid - 2 questions? [Re: lawnguy] #4573986
11/14/17 04:51 PM
11/14/17 04:51 PM
Joined: Sep 2013
Posts: 10,677
Indiana
dlundblad Offline
dlundblad  Offline
Joined: Sep 2013
Posts: 10,677
Indiana
Typically, store brand gear lube is good for topping off vehicles equipped with LSD. (ie a temporary fix meaning you're better to top off than burn up your diff.) That is it.. it's not replacement worthy. Someone please correct me if I am wrong.

M1 and Synpower will have your LSD additive. Synpower being somewhat cheaper. Both are exceptional products.


03 Jeep WJ 4.0 202k Castrol Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 186k M1 0w40 Mahle OX149D
97 Chevy Blazer 4.3 153k Synpower 5w30 Supertech ST3980 (Ecore)

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