Mopar 75w-140

[ensoniqman]

Find I'm having to need a change of diff rear gear fluid after 30,000 miles: I've been told to use 75w-140 for potential towing purposes...and not the 75w-90.

Is this correct?


It is for my 2011 RAM 1500, so I already know I need the Mopar friction modifier and only to use Mopar Gear oil
(same as my Jeep Grand Cherokee).


EM

 

[Rand]

Which rear axle do you have?

 

[Deleted member 89374]

Mobil 1 LS 75W-140. It works great for Limited Slip and Open Diffs. If you have a Torsen style diff then use a good oil without friction modifier. Delvac 1 80W-140, Castrol Syngear 80W-140, etc.

Also, if you have an Open or Torsen style Diff, use Delvac 1 75W-90. It handles the diffs in semi trucks quite well.

 

[NiwradND]

80w-140 is awful heavy for 1/2 ton trucks, especially in cold weather areas. 75w140 will not hurt your mileage as much as 80w-140.

 

[Snagglefoot]

Let’s see what 2500 and 3500 Ram gets in 2023. Only the diesel powered dually gets the 75w140. The mere gasoline powered trucks get 75w85.

 

[Greasymechtech]

https://vehicleinfo.mopar.com/assets/publications/en-us/Ram/2011/1500/714.pdf

Not sure but maybe page 583 in the link above will help.

There is no "only" concerning fluids. There are plenty of brands with equivalents concerning gear oils and LS additives. You don't need Mopar only gear oil or LS additive.

I'd use any 75w140. Most come with LS additive sufficient for an ol' tired/worn diff like yours. If you need more, then either add the Mopar or Lubegard LS additive.

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Local walmart had the valvoline 75w140 in the easy to use squeeze quart bags, along with their Supertech 75w140.

 

[ensoniqman]

2011 Ram 1500 rear end, 1/2 ton truck with Tow package.

I watched a video of a mechanic with the same truck, but he used 75w140.

 

[racer12306]

2011 Ram 1500 rear end, 1/2 ton truck with Tow package.

I watched a video of a mechanic with the same truck, but he used 75w140.

75w140 was the half ton spec up until sometime in 2018. Then they switched to 75w90 with a MS-A0160 call out and they backdated it to 2017 models.

I’ve got 6 quarts of HPL 75w90 ready to go in my front and rear.

 

[tnt_motorsports]

@ensoniqman I use 75w90 in my Ram 2500. It works just fine towing an 11K TT. I previously used M1 75w90 and switched to Mystik the last change. The Mystik was about half the cost of M1. The Mystik is full synthetic (on the bottle) even though the website notes Syn blend.

Mystik SX - 7 Synthetic Blend Gear Lubricant - 663745002017 | Blain's Farm & Fleet

Get your Mystik SX - 7 Synthetic Blend Gear Lubricant - 663745002017 at Blain's Farm & Fleet. Buy online, choose delivery or in-store pickup. Great prices on Automotive Greases & Gear Oils.

www.farmandfleet.com

Just my $0.02

 

[ensoniqman]

For whats its worth, I also read about the older rear diff in Ram/Jeep and they recommended the older GL5, Mopar Spec MS-8985:

2009-2023 Mopar Axle Lube 68218657AB | Mopar Estores

2009-2023 Mopar Axle Lube 68218657AB

store.mopar.com

I went ahead and ordered some, since if there is any towing to be done in summer here (average temps 80 - 105 degrees) I figure it wont hurt anything.


Thanks for the input.


EM

 

[wpod]

75W-140 is the go to differential viscosity for all my vehicles. As mentioned 80W- 140 is much thicker.

 

[ensoniqman]

And from another forum (RAM Rebel):

The description that comes up on dealer computer states the verbiage from the owner's manual in pertinent part for 2017+, 75w90 MS-A0160, C235 axle. However, it lists the wrong part number which is the previous oil used in the 2016 and below vehicles, which is, 68218657AA (75w-140 MS-8985). The proper part number should be 68340460AA (2017+ 75w90). The dealer did not even have this in oil in stock and knew nothing about it until I showed it to them in the MOPAR fluid catalog. Chrysler made this change for a reason, what I don't know but there is clearly confusion. Just figured I would share if anyone else likes to follow spec. See below excerpts right from the owner's manual for a 2015 and 2017:

FROM 2015 RAM 1500 Manual:
Rear Axle – 1500 Models We recommend you use MOPAR® Synthetic Gear Lubricant SAE 75W-140 (MS-8985). Limited-Slip Rear Axles require the addition of 5 oz. (148 ml) MOPAR® Limited Slip Additive (MS-10111).
FROM 2017 RAM 1500 Manual:
Rear Axle – 1500 Models We recommend you use Mopar Synthetic Gear Lubricant SAE 75W-90
(MS-A0160). Limited-Slip Rear Axles require the addition of 5 oz. (148 ml)
Mopar Limited Slip Additive (MS-10111).

 

[racer12306]

And from another forum (RAM Rebel):

The description that comes up on dealer computer states the verbiage from the owner's manual in pertinent part for 2017+, 75w90 MS-A0160, C235 axle. However, it lists the wrong part number which is the previous oil used in the 2016 and below vehicles, which is, 68218657AA (75w-140 MS-8985). The proper part number should be 68340460AA (2017+ 75w90). The dealer did not even have this in oil in stock and knew nothing about it until I showed it to them in the MOPAR fluid catalog. Chrysler made this change for a reason, what I don't know but there is clearly confusion. Just figured I would share if anyone else likes to follow spec. See below excerpts right from the owner's manual for a 2015 and 2017:

FROM 2015 RAM 1500 Manual:
Rear Axle – 1500 Models We recommend you use MOPAR® Synthetic Gear Lubricant SAE 75W-140 (MS-8985). Limited-Slip Rear Axles require the addition of 5 oz. (148 ml) MOPAR® Limited Slip Additive (MS-10111).
FROM 2017 RAM 1500 Manual:
Rear Axle – 1500 Models We recommend you use Mopar Synthetic Gear Lubricant SAE 75W-90
(MS-A0160). Limited-Slip Rear Axles require the addition of 5 oz. (148 ml)
Mopar Limited Slip Additive (MS-10111).

There’s not a lot of information about the newer spec. I just spent way too much time trying to figure it out. No one has any info about it.

This is one of the only threads that gets technical-ish https://bobistheoilguy.com/forums/threads/mopar-ms-a0160-spec-for-75w-90.328737/

If you follow your manual, you’ll be fine for sure.

 

[Greasymechtech]

Grade is a battle between MPG and wear

The 1st post said 2011. Who cares what the newer years use and is irrelevant, unless you're a hypermiler and are willing to sacrifice components for MPG.

Read your owners manual for the 2011. There is no confusion here. Quit making a mountain out of a mole hill

 

[NiwradND]

I normally run 75w140 in the rear and run 75W90 in the front, but I tow over max loads at times.

 

[Deleted member 89374]

I normally run 75w140 in the rear and run 75W90 in the front, but I tow over max loads at times.

Get some commercial grade gear oil. The commercial oils I recommended are all on the PRI, except for Mobil 1 LS 75W-140. If you really want to stick with 75W-140 for the rear, and not go up to a synthetic 80W-140, then get AMSOIL Severe Gear 75W-140 for the rear. It's good stuff.

 

[NiwradND]

I normally run 75w140 in the rear and run 75W90 in the front, but I tow over max loads at times.

Get some commercial grade gear oil. The commercial oils I recommended are all on the PRI, except for Mobil 1 LS 75W-140. If you really want to stick with 75W-140 for the rear, and not go up to a synthetic 80W-140, then get AMSOIL Severe Gear 75W-140 for the rear. It's good stuff.

80w140 doesn't work well when it gets 40 below zero here in North Dakota as it channels and won't lubicate the gears as it is frozen at that temperature and you get extreme wear. 80w140 are mostly non-synthetic gear lubes. I have used Amsoil if extreme conditons are in effect and Valvoline if normal driving is expected.

 

[MSCH]

80w140 doesn't work well when it gets 40 below zero here in North Dakota as it channels and won't lubicate the gears as it is frozen at that temperature and you get extreme wear. 80w140 are mostly non-synthetic gear lubes. I have used Amsoil if extreme conditons are in effect and Valvoline if normal driving is expected.

its worth pointing out nothing in the mechanical world functions very well at minus 40.

 

[NiwradND]

its worth pointing out nothing in the mechanical world functions very well at minus 40.

True, but 80w140 will hurt fuel economy at all temperatures and 75w140 will have superior wear and temperature protection in most conditions.

 

[userfriendly]

80w140 doesn't work well when it gets 40 below zero here in North Dakota as it channels and won't lubicate the gears as it is frozen at that temperature and you get extreme wear. 80w140 are mostly non-synthetic gear lubes. I have used Amsoil if extreme conditons are in effect and Valvoline if normal driving is expected.

Which 80w140 is "non-synthetic"?
Would pour point and channel point be the same?