Differential Oil

[Obus]

My 2021 Wrangler Sport JL manual says use SAE75W85 oil in the front axle and then use SAE75W140 on the rear (M200 Sales Code DRZ). But if I have a rear axle (M220 Sales Code DRE/DRF) use SAE75W85? How do I know what I have?

Sponsored

 

[autotragic]

Just use the 75W140. The thinner oil is purely for fuel economy.

 

[chevymitchell]

Just use the 75W140. The thinner oil is purely for fuel economy.

Agreed.

75w140 for the rear
75w90 for the front

 

[Whiskey 13]

I use 75w140 front and rear, live in where it is hot most of the year.

 

[Pape]

My 2021 Wrangler Sport JL manual says use SAE75W85 oil in the front axle and then use SAE75W140 on the rear (M200 Sales Code DRZ). But if I have a rear axle (M220 Sales Code DRE/DRF) use SAE75W85? How do I know what I have?

Little off topic here but how do you find the sale code ?

 

[roaniecowpony]

75w140 GL-5 for front and rear on my JLUR D44s.

 

[Terrymo]

As others have already said
https://www.amazon.com/dp/B08KB5LTJM?ref_=ppx_hzsearch_conn_dt_b_fed_asin_title_5

 

[Kracka]

Count me as the odd man out: I stick to OEM recommended spec and use Redline 75W-85 GL-5 gear oil front & rear in our Rubicon and Amsoil SG 75W-85 GL-5 gear oil front & rear in our Grand Cherokee.

 

[Speed331]

Just use 75/140 for both. Makes buuing gear oil easier and is what Dana (not Jeep) reccomends for the axles. You might see a 1% drop in fuel ecoomy, but I'll take the manufacturers advice.

I will add, when I did my first gear oil change at 40k the origional fluid was black and a bit stinky. Just chsnged again after 80k miles and it looked brand new

 

[roaniecowpony]

If I dunk it in water, I try to remember to change it not too far down the road.

 

[Heimkehr]

Just use 75/140 for both. Makes buuing gear oil easier and is what Dana (not Jeep) reccomends for the axles. You might see a 1% drop in fuel ecoomy, but I'll take the manufacturers advice.

+10.

After my selling dealer refused to perform a transmission fluid and filter change, despite my having a page from ZF that recommends that service at ~60K miles, I decided to investigate what the actual designer/manufacturer of other drivetrain components recommend for periodic maintenance.

As soon as I found data from Dana that recommended, or at least allowed, the use of 75W-140 in both of my axles, and in contravention of the thin sauce that FCA used to chase that last tenth of fuel economy, I pivoted to that particular gear oil and haven't looked back.

Owning a JL-generation Jeep has been very instructive, in terms of discovering the many things a manufacturer will attempt, not all of which I like or would otherwise allow, in the endless chase for fractional improvements in average fuel mileage. The interwebs gets full credit for shining a light on such efforts, and how the informed owner may safely work around them and to the benefit of the vehicle's longevity itself.

 

[gm920]

Little off topic here but how do you find the sale code ?

Call the dealership.

 

[Whiskey 13]

Dana has been recommending 75W140 for a long time and if you notice a drop in MPG going from 85 or 90 to 140 put 2 PSI more air in your tires LOL

 

[zouch]

note that all of the preceding advice assumes stock components.
if you've updated to use something like an Eaton Gear-driven Limited Slip, they may recommend something else entirely.

bottom line; we need to look at what the manufacturers of our parts recommend; J**p is more interested in serving their own interests (warranty CAFE, etc.) than the longevity of our equipment.

 

[roaniecowpony]

If you have modified your jeep with larger tires, different gears, added weight, etc., your use may be more severe than the Jeep envisioned. So 75w85 in the front axle as Jeep recommends, may not be up to the job. Going with what Dana, the axle manufacturer recommends (75w140 GL-5) will provide more margin in the lubrication protection when the axle is subject to loads that Jeep did not design or test for.

Sponsored