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#4784005 - 06/11/18 03:24 PM 75W-110 Gear Oils
dogememe Offline


Registered: 04/15/17
Posts: 804
Loc: SF BAY AREA, CA
Ford specs 75w-90/80w-90 for civilian Vics and 75w-140 for CVPIs but it's the same diff...

I'm torn between using 75w-90 for improved fuel economy and 75w-140 for better protection during aggressive driving or extended highway trips that may or may not involve higher than suggested operating speeds. Obviously my usage is not as severe as typical police use, but it's also not your average grandma driving.

It looks like there are a few companies making 75W-110, one of them being Amsoil. I've never used Amsoil products before. but I'm thinking this seems like a good middle ground in terms of fuel economy and protection at high temperatures.

Anybody used 75W-110 before, and if it's a good idea, where can I buy this at the best price? The price seems reasonable compared to other quality synthetic gear oils like Royal Purple (which is what was gonna end up in this diff before I came across that Amsoil), etc. I plan to change it every 60K miles.

https://www.amsoil.com/shop/by-product/gear-lube/severe-gear-75w-110/


Edited by dogememe (06/11/18 03:27 PM)
_________________________
2007 Crown Vic P71 4.6 ~124K Miles, Valvoline Advanced Synthetic 5W-30, Royal Purple Filter, Daily Driver.
2010 Escape FWD 2.5 ~78K Miles, Castrol Edge EP 5W-30, Wix Filter, Rented on Turo.

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#4784015 - 06/11/18 03:36 PM Re: 75W-110 Gear Oils [Re: dogememe]
demarpaint Offline


Registered: 07/03/05
Posts: 30150
Loc: NY
I was thinking the exact same thing this morning. I just did the differentials on both of my Jeeps and plan on doing my 88 E-150 possibly next week. I was thinking of using 75W-90, or 75W-110, which is not easy to find locally. I shot my buddy Trav an email and went with his recommendation of 75W-140 for the Ford.
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#4784042 - 06/11/18 03:57 PM Re: 75W-110 Gear Oils [Re: dogememe]
hatt Offline


Registered: 01/03/12
Posts: 4535
Loc: Florida
I'd just use 75w-140 if you're worried about it. Amsoil has a pretty good price on it. Get with Pablo.
_________________________
2013 F150 5.0, PUP 10W-30, Wix 57502
2010 Camry 2.5, GTX 5W-20, Fram Ultra XG9972

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#4784044 - 06/11/18 03:59 PM Re: 75W-110 Gear Oils [Re: hatt]
dogememe Offline


Registered: 04/15/17
Posts: 804
Loc: SF BAY AREA, CA
Originally Posted By: hatt
I'd just use 75w-140 if you're worried about it. Amsoil has a pretty good price on it. Get with Pablo.


I wouldn't say worried is the right word. But for the same price as 140, the 110 will give be better fuel economy and I drive quite a bit. I'm sure calming down my driving habits matters more than the viscosity of the gear oil in the rear diff but money saved is always good.


Edited by dogememe (06/11/18 04:02 PM)
_________________________
2007 Crown Vic P71 4.6 ~124K Miles, Valvoline Advanced Synthetic 5W-30, Royal Purple Filter, Daily Driver.
2010 Escape FWD 2.5 ~78K Miles, Castrol Edge EP 5W-30, Wix Filter, Rented on Turo.

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#4784048 - 06/11/18 04:03 PM Re: 75W-110 Gear Oils [Re: dogememe]
hatt Offline


Registered: 01/03/12
Posts: 4535
Loc: Florida
If you're worried about fuel economy use the recommended 75w-90. Pablo is an Amsoil rep here.
_________________________
2013 F150 5.0, PUP 10W-30, Wix 57502
2010 Camry 2.5, GTX 5W-20, Fram Ultra XG9972

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#4784062 - 06/11/18 04:24 PM Re: 75W-110 Gear Oils [Re: dogememe]
JLTD Offline


Registered: 12/15/17
Posts: 931
Loc: US
.


Edited by JLTD (06/11/18 04:24 PM)
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Hers: 2008 Jeep Liberty 138k, AMSOIL® SS 5w30/Amsoil

His: 2015 4Runner 41k, AMSOIL® OE 5w20/Wix

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#4784068 - 06/11/18 04:35 PM Re: 75W-110 Gear Oils [Re: dogememe]
skyactiv Online   content


Registered: 03/02/13
Posts: 4623
Loc: The Midwest
_________________________
Wife: 15' Audi A4 quattro 6 speed manual
Me: 13' VW GTI 3 door 6 speed manual

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#4784085 - 06/11/18 04:55 PM Re: 75W-110 Gear Oils [Re: dogememe]
2015_PSD Online   content


Registered: 09/26/10
Posts: 7467
Loc: SE Texas
75W-110 is the upper viscosity that 75W-90 used to be before the J306 tables were updated. I have used Amsoil 75W-110 in the front axles of my 2010 FX4 and my 2015 F250 with no issues.
_________________________
2018 MB AMG GLC43 3.0L Coupe - Castrol 0W-40/Purflux
2018 MB C300 2.0L - M1 0W-40/OEM
2015 F-250 6.7L PS Diesel - Delo 15W-40/CQ Blue
2014 Explorer 3.5L Limited - M1 AFE 0W-20/FU

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#4784091 - 06/11/18 05:04 PM Re: 75W-110 Gear Oils [Re: skyactiv]
dogememe Offline


Registered: 04/15/17
Posts: 804
Loc: SF BAY AREA, CA
Originally Posted By: 2015_PSD
75W-110 is the upper viscosity that 75W-90 used to be before the J306 tables were updated. I have used Amsoil 75W-110 in the front axles of my 2010 FX4 and my 2015 F250 with no issues.


Very intersting information, thank you. Looks like I will be purchasing 75W-110 when I change the diff oil!

Originally Posted By: skyactiv


Any reason in particular? Is this better than the Amsoil product?
_________________________
2007 Crown Vic P71 4.6 ~124K Miles, Valvoline Advanced Synthetic 5W-30, Royal Purple Filter, Daily Driver.
2010 Escape FWD 2.5 ~78K Miles, Castrol Edge EP 5W-30, Wix Filter, Rented on Turo.

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#4784100 - 06/11/18 05:12 PM Re: 75W-110 Gear Oils [Re: dogememe]
cronk Offline


Registered: 01/06/09
Posts: 1302
Loc: Watertown, New York
I was in a similar situation.
My 1998 GMC C1500 called for 80w90 in the rear diff. I was planning on doing quite a bit of towing with it, had a couple trips towing my camper.
I ended up using the 75w110 Amsoil Severe Gear and my truck towed the camper from NY to Illinois, to the Adirondack mountains in NY, and another trip across NY.
The 75w110 was just the thing, and you would be hard pressed to find a gear lube better than Severe Gear!
_________________________
1998 GMC C1500
2003 Chevy Cavalier
2011 Nissan Quest
1986 Pontiac Trans Am
1940 Ford 9N Tractor
Amsoil lubes and filters!

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#4784134 - 06/11/18 05:56 PM Re: 75W-110 Gear Oils [Re: dogememe]
mx5miata Offline


Registered: 03/28/10
Posts: 654
Loc: NY
I used Lucas 75-140 with Ford friction modifier when I had my 98 F150. 3.55 LSD
_________________________
NAPA FULL SYNTHETIC 0w20 Partsplus oil filter
Wix air filter

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#4784142 - 06/11/18 06:07 PM Re: 75W-110 Gear Oils [Re: dogememe]
MaximaGuy Offline


Registered: 09/20/03
Posts: 1253
Loc: Austin, TX
Used the Amsoil 75W110 the year it was introduced and never looked back and it has served my x-case and differential quite well.
Presently on RL 75W110 on both units, personally prefer Amsoil, when it came out after 100K on it, it was slightly dark - could have gone further (don't tow on my vehicle)
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2018 MB GLE350
2011 Lexus ES350
2006 Toyota Highlander 4WD

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#4784190 - 06/11/18 06:45 PM Re: 75W-110 Gear Oils [Re: dogememe]
aquariuscsm Offline


Registered: 12/30/06
Posts: 18439
Loc: Dallas,Tx USA
I use Amsoil Sever Gear 75W110 in my 300ZX's rear diff that specs 80W90.
_________________________
1996 Nissan 300ZX 5-speed,Arctic Pearl(#175 of 300)
Quaker State Ultimate Durability 10W30
2012 Honda Accord Coupe EX-L 2.4,auto,San Marino Red
Quaker State Ultimate Durability 5W30


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#4784232 - 06/11/18 07:24 PM Re: 75W-110 Gear Oils [Re: dogememe]
69Torino Online   content


Registered: 12/12/17
Posts: 320
Loc: Indy
You won’t see a fuel economy difference between any of those weights. Go with 75-140. I have a Mercury Marauder, and Ford back spec’d my car to 75-140 from 80-90 for a reason, in a TSB. The reason was axle shaft heat treating, but when I put axles in it I went ahead and filled it back up with Valvoline Synpower 75-140. The extra protection is worth the extra $1 a quart. I changed and the car still gets 20mpg if I drive like a sane person. Also running 5w-30 in the engine... if you ask your government I should be getting atrocious fuel mileage.
_________________________
1969 Ford Torino GT 390 Auto
2003 Mercury Marauder
1992 Mercury Capri Convertible
2005 Ford Freestyle
2008 Hyundai Santa Fe
2015 Kia Optima
1947 Ford 2N
1978 Honda XL75
Plus Other Stuff...

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#4784275 - 06/11/18 08:10 PM Re: 75W-110 Gear Oils [Re: dogememe]
A_Harman Offline


Registered: 10/01/10
Posts: 6972
Loc: Michigan
I just ran 260k miles on the Dana 80 in my Dodge, about 130k of that towing, and the axle now needs a rebuild. 75W-90 the whole time. Would it have lasted longer on 110 or 140? Or should I be happy with 260k miles?
_________________________
1985 Z51 Corvette track car
2002 Camaro Z28 LS1/6-speed
2001 Dodge Ram 2500 diesel
1972 GMC 1500 shortbed project truck

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