Better rear diff oil

[dexter]

I skimmed over the rants but as a person who tests these axles on a daily basis you are doing nothing going to a thicker weight oil. The bearings are designed for a certain flow that you could actually cut down on with a thicker oil. Do what you want but it won't help.

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There are people who think:

'more is better'

they haven't seen or heard about any problems with going thicker

relying upon information about older technology

they know better then an engineer

 

[SyN]

I skimmed over the rants but as a person who tests these axles on a daily basis you are doing nothing going to a thicker weight oil. The bearings are designed for a certain flow that you could actually cut down on with a thicker oil. Do what you want but it won't help.

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I’m not questioning your experiences & knowledge in fact I respect your input.

Question: Let’s say these exact same bearings were submerged in this gear oil 24/7? Not ever relying on splash lubrication like the gear set. So constant lubrication was in place.

For the record: I worked with & around many of these so-called engineers who we as operators for 17-25 years were constantly re-designing reconfiguring their screw ups constantly. To make the design or mechanical device better or actually work/function.
Please excuse my confidence factor in these gentleman since it is not very high due to they created three times the work for us operators.

Like I said doing the reading and research so far over the last two months all I’ve seen is the 75W-90 is recommended due to increased miles per gallon never have I read where it recommened for lower wear and increased longevity compared to the 110 or 140 gear oils.
Actual white paper data testing would be ideal since word of mouth is similar to Facebook anymore.

This subject I guess will be similar to the oil thread.
No definitive answer just thoughts & opinions.

I come across a gentleman over on another Ram Forum whom had accumulated over 193K miles on his 2015 Ram 2500 w/ AAM 11.5 while running Amsoil 75W-140 since the 20K mile mark with Zero issues.

If I was only keeping my Ram for 5-6 years I wouldn’t give 3 $Hits! But this is going to be my last tow vehicle & will keep her well beyond her payoff years. (10-17yrs) So I am going to be a bit selective on ALL my Fluid/Oil choices. Yup I am different then most!

I guess in my mind routine service of this unit is more important then gear oil viscosity. If you don’t live in the frozen tundra.
Even though it has been proven over & over running a heavier viscosity will not cause any long term problems or issues. (Even over 100K-200K miles).

Pardon my odd way of thinking & looking at things my Box is small.

 

[loveracing1988]

I’m not questioning your experiences & knowledge in fact I respect your input.

Question: Let’s say these exact same bearings were submerged in this gear oil 24/7? Not ever relying on splash lubrication like the gear set. So constant lubrication was in place.

For the record: I worked with & around many of these so-called engineers who we as operators for 17-25 years were constantly re-designing reconfiguring their screw ups constantly. To make the design or mechanical device better or actually work/function.
Please excuse my confidence factor in these gentleman since it is not very high due to they created three times the work for us operators.

Like I said doing the reading and research so far over the last two months all I’ve seen is the 75W-90 is recommended for increased miles per gallon never have I read where it offers lower wear and increased longevity compared to the 110 or 140 gear oils.

If constant lubrication was in place as in they were submerged like the diff case bearings the oil wouldn't really matter. Thicker oil would be fine at that point. Since it is the real world though and they do rely on the oil thrown up by the ring gear I stand by what I said. To add food for thought the next gen rear axles behind the Cummins dually are running 75w140 oil, so when run at the loads they are seeing obviously the 75w90 isn't good enough. Since a srw vehicle will never see those loads though it is pointless.

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[dexter]

I come across a gentleman over on another Ram Forum whom had accumulated over 193K miles on his 2015 Ram 2500 w/ AAM 11.5 while running Amsoil 75W-140 since the 20K mile mark with Zero issues.

.

"Absence of evidence is not evidence of absence,"

The question isn't if there is a problem with 140.

The question is if it has any benefit over 90.

The answer so far is no.

 

[SyN]

"Absence of evidence is not evidence of absence,"

The question isn't if there is a problem with 140.

The question is if it has any benefit over 90.

The answer so far is no.

We will Never Know!! Now will we?
Reverse that question: What benefit does 90 hold over 110/140?
Possibly/Maybe a very slight mpg difference? Our government would be thrilled!
I honestly see nothing else.
If 90wt was required? I would totally have different thinking & run it. (No questions asked)

So what difference does it make what viscosity or brand each owner uses? It doesn’t!
Just don’t ever try to convince me that 90wt offers lower wear & longer longevity compared to 140 or 110 viscosity gear oils. (That’s it in a nutshell)
If there is ANY (Actual/Truthfull) evidence out there that shows or proves this please post it here. I just have never witnessed it.

I myself don’t give 2 Hoots what others use or run. It’s No Concern of mine.
My Ram is my only concern.
I’m not paying any extra for the 75W-110 so I see no benefits I’m missing out on.

One more time & I’ll walk away: I have no issue with 75W-90! (Never have) I only want to experience running 75W-110. Im just not a follower! (Never Have / Never Will)
There is a HUGE difference between Recommended & Required.

Ok: I apologize I’m done.
I want to thank my wife for not having blind faith in the 2 A$$ hat doctors 19 yrs ago that attempted to think they New best due to a degree & diagnosed my health issue totally wrong.
I would not be here today if not for her calling BS & thinking outside the box & getting another doctor involved with totally different opinion.

 

[dexter]

Just don’t ever try to convince me that 90wt offers lower wear & longer longevity compared to 140 or 110 viscosity gear oils.

Oh! I know that!

 

[valvestem]

My two cents is full synthetic 75-140.

 

[U&A]

Drop the group 3 base stock oils and Check out redline sir,

Ther is literally nothing better for gears than ester/pao base stock oils.

Seriously

The only thing you have to watch for is lockers. Some of them dont work with Synthetics.

If a bottle says “synthetic” but dosnt say “ester” than it is most likely a group 3. Very few but some blend geoup 3 witb PAO. But the wont tell you. But when they are proud of their product and tell you what they use...like ester’s. You found a winner