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Discussion Starter · #1 ·
Hoping you folks can sense check these selections for me for our 2011 6-speed Sport, with a rear LSD. I'm looking at the synthetics to improve gear efficiency.

Diffs:
Front:​
Spec:​
MOPAR Gear & Axle Lubricant (SAE 80W-90) (API GL-5) or equivalent.​
Synthetic:​
Mobil 1 Synthetic Gear Lube LS 75W-90

Mobil 1 Synthetic Gear Lubricant LS 75W-90 is SUITABLE for use in modern high performance automobiles like SUV's, Vans and Light duty trucks requiring API GL-5 level performance

Rear:​
Spec:​
MOPAR Gear & Axle Lubricant (SAE 80W-90) (API GL-5) or equivalent. For trailer towing, use MOPAR Synthetic Gear & Axle Lubricant (SAE 75W-140) or equivalent. Models equipped with Trac-LokTM require an additive.​
Synthetic:​
Mobil 1 Synthetic Gear Lube LS 75W-140

Mobil 1 Synthetic Gear Lubricant LS 75W-140 is recommended for use in modern high performance vehicles like sport utility vehicles, vans and light duty trucks requiring API GL-5 performance that require excellent durability

Mobil 1 Synthetic Gear Lube 75W-140 LS contains special friction modifiers designed for limited slip-type differentials. In most applications, the addition of special LS (limited slip) additives is not required. For axles requiring the highest level of limited-slip performance, OEM specific LS additives can be added to this fluid.

Question: Add the Mopar additive or not????

I'm thinking "Yes" if for nothing else than to not have any warranty questions if needed in the future.

T-case:
Spec:​
MOPAR ATF+4 Automatic Transmission Fluid or equivalent licensed ATF+4 product.​
Synthetic:​
Valvoline ATF +4™ Full Synthetic (Designed to meet the specific requirements of Chrysler, Dodge & Jeep vehicles)​

Transmission:
Spec:​
MOPAR Manual Transmission Lubricant or equivalent (meeting the re- quirements of Chrysler Material Standard MS-9224).​
Synthetic:​
Amsoil Synthetic Manual Synchromesh Transmission Fluid (MTF)
Specifications include:
• Chrysler MS-9224​
 

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I switched all my fluids to syn. The engine oil got changed over at 1.5k and all the others got changed at 18k.

The only non engine fluid that was really dirty at 18k was the rear diff., all others were still like new.

No noticeable gain in mpg.

I still change the engine oil at 3-3.5k.
 

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i use royal purple in my truck. I love the stuff. i have an 02 sonoma 4x4 with 82.5k on it. i'm slowly changing the wrangler over to royal purple so far just have the engine oil when i do all the fluids here soon it will all go royal.
 

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Discussion Starter · #4 ·
Hoping you folks can sense check these selections for me for our 2011 6-speed Sport, with a rear LSD.
Any more wisdom on my selections? I was trying to find ones that definitely mentioned the specifications from the manual.
 

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I changed all of the fluids in mine to Amsoil synthetic. It met all of the specs. I have the factory limited slip and I did not need the additive with the Amsoil.
 

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Discussion Starter · #8 ·
Hoping you folks can sense check these selections for me for our 2011 6-speed Sport, with a rear LSD. I'm looking at the synthetics to improve gear efficiency.
So nearly 2-1/2 years later, about a month ago I finally got around to changing the drivetrain fluids to synthetic in the Jeep... only difference from my list in post #1 is that I used Castrol ATF+4.

It may be wishful thinking, but it seems like our mpg is up... maybe 1 mpg? To be honest, I don't religeously check the mileage because it's too depressing, but the dash readout has been consistently higher than I remember...

Does anybody have some real numbers. Unfortunately (actually fortunately), my wife also changed her driving route a bit recently due to a new job, so that could be the factor as well.
 

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Discussion Starter · #10 ·
Is it difficult to do? Home project?
Not difficult, and Sure.

You need to make a 17mm hex tool to drain the manual trans. I bought a 17mm allen wrench off amazon and cut off about 1-1/4".

And buy a little bottle pump from the auto parts store.

Straight forward otherwise.
 
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