rear end fluid

[Turbo Terry]

Ozy I agree seems a little soon me. The fact that I got the factory fill out at 3 k means a lot I think. Amsoil severe duty should go many a mile I would think

 

[NIsaacs]

What a waste of Ressources to throw that almost mint Oil away.. that's barely broken in.
As you can see in the schedule there is NO planned replacement for standard duty, not even at 240'000 Miles, it says inspect the OUTSIDE for leaks and check level IF it leaks - it's a Lifetime fill, not even the level is checked on a regular basis. So on a standard truck, that diff won't be opened for 20 years or so.
Your truck isn't severe duty if it comes to the axle for carrying a small Camper for 2 Months a year - ask @Cummins12V98 what severe duty means.

I agree.

Don't get me started again, on Mopa'rs Maintenace schedule I will bring up one little spec, of a dozen.

Aisin, the "good" transmission, gets a fluid change every two years or 30k miles, normal or severe, no difference.

68RFE, the "junky" transmission goes 4 years or 60k miles severe, or 8 years and 120k miles for normal.

 

[p-Bar]

Mopar wants you to lube the cardon joint at evey oil change. It doesn't spin unless its in 4wd

 

[Ozymandias]

Ozy I agree seems a little soon me. The fact that I got the factory fill out at 3 k means a lot I think. Amsoil severe duty should go many a mile I would think

Open the fill, stick your finger in, inspect, if it looks great leave it alone. These axles don't fail.

I'm myself a guy that does preventive maintenance, sometimes more then what's needed from the schedule. But i don't waste my money for stuff that is perfectly fine.

If you really want to change that oil every 2 years you can buy the cheapest of the cheapest oil from the shelf somewhere in a bargain store and still be fine at that short intervals.
On a modern OTR truck the axle oil stays in for hundreds of thousands of miles - and they are severe duty.

 

[AH64ID]

Ozy I agree seems a little soon me. The fact that I got the factory fill out at 3 k means a lot I think. Amsoil severe duty should go many a mile I would think

Amsoil rates the fluid for 50K miles severe and 100K miles normal service, but you mentioned your warranty. It comes down to wanting to fight with Ram or not, but we really don’t have axle issues.

I run the SVG in my 4Runner for 100K miles and it comes out looking pretty new.

 

[Cummins12V98]

I read my schedule and I thought it was 24k severe duty but the reality was it's 24,250 kilometers and 15k. So I really screwed up! I was on a trip with a few thousand miles to home and noticed when taking off and turning it felt like it does with 4wd on turning on pavement. Why I did not do an early change I have no idea!!!

Bottom line this lube was TOAST at 24,000 miles per report. Good share of the miles were towing a combined 34k.

Since that change I have been doing 20-25k and the lube comes out looking good and the cover is no where as dark. AMZ/OIL 75-110 Severe

 

[Cummins12V98]

Mopar wants you to lube the cardon joint at evey oil change. It doesn't spin unless its in 4wd

I have lubed mine ONCE in 110k.

 

[AH64ID]

Mopar wants you to lube the cardon joint at evey oil change. It doesn't spin unless its in 4wd

But it gets lots of road grime, salt, and water splashed into it. Grease it to protect it, even if it doesn’t spin.

There is quite the difference in appearance on front shafts that are greased vs ones that aren’t.

It’s a completely different joint on my 22, sealed and no ability to grease it.

I read my schedule and I thought it was 24k severe duty but the reality was it's 24,250 kilometers and 15k. So I really screwed up! I was on a trip with a few thousand miles to home and noticed when taking off and turning it felt like it does with 4wd on turning on pavement. Why I did not do an early change I have no idea!!!

Bottom line this lube was TOAST at 24,000 miles per report. Good share of the miles were towing a combined 34k.

View attachment 139064 View attachment 139065 View attachment 139066 View attachment 139067 View attachment 139068

Luckily the 19+ OEM lube is much better than the previous OEM lube. I still dumped it early, but it wasn’t nearly as bad.

 

[Ozymandias]

The first change always looks horrible from the gears break-in period.
Mine was the same when I regeared it.
I'd say that no matter what oil you have in it will look bad at the first change.
Afterwards it should stay nice for 60k or so.

 

[Diesel85]

The first change always looks horrible from the gears break-in period.
Mine was the same when I regeared it.
I'd say that no matter what oil you have in it will look bad at the first change.
Afterwards it should stay nice for 60k or so.

I totally agree with @Ozymandias.

I recently did my 2020 EcoD's front and rear diff fluids at 51k miles. The front looked fine, but the rear you could tell it needed changing.

I plan on doing them again at another 50k miles.

Also, I view it as piece of mind that I know if I start seeing more metal, that a rebuild is in store. Usually the next thing that comes is gear whine.

 

[AH64ID]

Yes the initial fluid is always worse from break-in, but the early 4th gen fluid was known to be poor quality on top of that. There was even a TSB published about changing the fluid before diagnosis of any issues incase the fluid was creating problems. That’s not normal, break-in or not.

 

[Ozymandias]

Uh that bad? So the bean counters really had their share there.

 

[Cummins12V98]

Uh that bad? So the bean counters really had their share there.

Mine was toast per report at 24k. Actually before that as per my grabbing on turns.

 

[seafish]

Good info here...I just wish that someone would edit the title of this thread to something less graphic.

 

[Cummins12V98]

Good info here...I just wish that someone would edit the title of this thread to something less graphic.

HAAAAAAAA

 

[NIsaacs]

On a modern OTR truck the axle oil stays in for hundreds of thousands of miles - and they are severe duty.

Just thinking out loud here, nothing to really back up my thoughts.

A big truck is only running slightly more power than a Ram, has two axles, mostly, and they are not torsion axles.

I always figured torsion axles were hard on oil. Eaton recommends standard oil first and synthetic oil second on their limited slip torsion diffs. I always wondered about that.

I wonder if the 19+ trucks are easier on the rear axle fluid.

 

[AH64ID]

Just thinking out loud here, nothing to really back up my thoughts.

A big truck is only running slightly more power than a Ram, has two axles, mostly, and they are not torsion axles.

I always figured torsion axles were hard on oil. Eaton recommends standard oil first and synthetic oil second on their limited slip torsion diffs. I always wondered about that.

I wonder if the 19+ trucks are easier on the rear axle fluid.

The high power 15L engines can make over 2K lb/Ft, that’s quite a bit more power to transfer to the wheels.

Is torsion the correct term? When I see a torsion axle it’s about suspension, not internals. There are torsen style differentials, but the 19+ trucks don’t use that style.

I kinda figured the 19+ LSD trucks would be harder on oil because the LSD has a clutch pack now and that will wear and contaminate the fluid more than the helical gears that were used in 03-18.

 

[bcbender]

I kinda figured the 19+ LSD trucks would be harder on oil because the LSD has a clutch pack now and that will wear and contaminate the fluid more than the helical gears that were used in 03-18.

We'll see, Ima change mine soon (so I kind of adhere to that whole 36k thing....) but not the front, just check. I dumped my OE fill around 10k... so i'll have 20 on it. I agree its wasteful for sure.. it'll make good firestarter tho.

 

[AH64ID]

The smell of used gear oil is enough reason for me to not want to use it for bar lube, yuck.

 

[Topzide]

@bcbender, that wasn't me that uses as bar oil. That was @GSP7 that said he does that. I know better to use bar oil only in saws. There's no tackifier in the oil which holds it to the bar and chain. That might have been okay 40 yrs ago, but newer saws would go through bars and chains faster. Manually pumped oilier might be okay but not automatic pumps. Worked in repair shop and show some of the horrors of using used oil in saws! But hey, if that's what you want to do with your equipment, your dime!