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#2604352 - 04/19/12 09:21 PM What oil for a Ford with a Sterling rear axle?
Chris142 Offline


Registered: 06/05/03
Posts: 12480
Loc: apple valley, ca
This is on my New to me 87 F250. The owners manual does not give weights...Just a Ford part number.
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87 F250 Diesel Mystic 15w50
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#2604385 - 04/19/12 09:51 PM Re: What oil for a Ford with a Sterling rear axle? [Re: Chris142]
Jim_Truett Offline


Registered: 01/07/09
Posts: 159
Loc: San Diego, California
The 10.25" rear diff in '87 used 75w-90 synthetic according to my records.
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#2604413 - 04/19/12 10:20 PM Re: What oil for a Ford with a Sterling rear axle? [Re: Chris142]
Bgallagher Offline


Registered: 04/17/12
Posts: 1423
Loc: Boston, MA
How does the fluid look? You might want to run it for a short period with cheap Dino to flush it out before you go synthetic.
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#2604433 - 04/19/12 10:45 PM Re: What oil for a Ford with a Sterling rear axle? [Re: Chris142]
RamFan Offline


Registered: 05/09/10
Posts: 1684
Loc: Illinois, U.S.A
Originally Posted By: Chris142
This is on my New to me 87 F250. The owners manual does not give weights...Just a Ford part number.


Just out of curiosity, which engine?

I had an '88 F250 XLT Lariat with the 7.5l V8 in it as my first vehicle. I miss it, wish I could buy it back and restore just so I could keep my first vehicle.
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#2604436 - 04/19/12 10:47 PM Re: What oil for a Ford with a Sterling rear axle? [Re: Chris142]
Chris142 Offline


Registered: 06/05/03
Posts: 12480
Loc: apple valley, ca
6.9 diesel with a 4 speed stickshift
_________________________
02 Wrangler durablend 10w40
87 F250 Diesel Mystic 15w50
04 Tahoe super-s 5w30
Z400 Lucas 10w30
KLR250 Maxima 10w40
Polaris Trailblazer delo 5w40

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#2604546 - 04/20/12 05:12 AM Re: What oil for a Ford with a Sterling rear axle? [Re: Chris142]
Roadkingnc Offline


Registered: 07/16/11
Posts: 664
Loc: NC USA
75w140 synthetic

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#2604774 - 04/20/12 12:02 PM Re: What oil for a Ford with a Sterling rear axle? [Re: Chris142]
Jim Allen Offline


Registered: 08/12/05
Posts: 4477
Loc: NW Ohio
Depends how it's used. Tow a lot, tow heavy,tow in hot weather, use a 140. A 75W140 syn is best because it will deliver the last loss sue to viscosity .Otherwise a good 90 grade is fine and saves you a little mpg. I have all the manuals for my '86, and here is what it calls out: Ford Spec ESA-M2C154-A , which was a 80W90 oil (-15F-100F). They called for a 85W140 in ambient temps +15F- over 100. Syn gear oils were virtually unknown then, so you can translate. FWIW, I run a 90 grade in my truck (the LE607 in the story below)

For To the Point info, go here: Diff Oil Temps
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Keepin' the Good Old Days of Four Wheeling Alive

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#2604776 - 04/20/12 12:04 PM Re: What oil for a Ford with a Sterling rear axle? [Re: Chris142]
Rob_Roy Offline


Registered: 10/26/08
Posts: 852
Loc: Northern, NY
My 10.25" pulls heavy loads in the summer, and plows snow on the winter. Amsoil 75w140 works great for me.
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#2605122 - 04/20/12 06:45 PM Re: What oil for a Ford with a Sterling rear axle? [Re: Chris142]
Chris142 Offline


Registered: 06/05/03
Posts: 12480
Loc: apple valley, ca
I don't normally tow anything. Just going to use the truck to haul Prospecting equipment and maybe a quad out into the desert.
_________________________
02 Wrangler durablend 10w40
87 F250 Diesel Mystic 15w50
04 Tahoe super-s 5w30
Z400 Lucas 10w30
KLR250 Maxima 10w40
Polaris Trailblazer delo 5w40

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#2605124 - 04/20/12 06:46 PM Re: What oil for a Ford with a Sterling rear axle? [Re: Chris142]
OVERKILL Offline


Registered: 04/28/08
Posts: 28677
Loc: Ontario, Canada
The AMSOIL gear lube in 75w140 is a solid choice.
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#2765522 - 10/07/12 10:22 AM Re: What oil for a Ford with a Sterling rear axle? [Re: Chris142]
buck91 Offline


Registered: 04/17/12
Posts: 803
Loc: West Michigan
Looking to refresh the rear did oil on my 99 f250. Same rear end manual specs 75w140 synthetic ... seems the jury is out on whether going to lighter 75w90 in a low/no towing situation is alright??
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