Whining about M1 75W-90

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I'm not doing the whining. It is my front differential in my '05 Yukon.

I recently changed the front diff gear oil and used M1 75W-90. The truck has about 80K miles on it and I bought it about 6K miles ago. I don't know if the differentials were ever serviced prior to this.

After changing the oil my font diff started whining. I drove it for a couple weeks and then rechecked the oil level and it was perfect.

Some people on a GM forum have suggested using Schaeffer's 267 or 293 gear oil for the whine. Stating that the moly will probably take care of the whine after 500 miles or so. Then if it doesn't go away it is probably a bearing issue.

Thoughts? Recommendations?
 
Re the hubs stuck engaged? My Toyota transaxle was whining with the factory syn GL-4, I used GL-5 amalie and this cleared it up in about 2 k miles. Your truck uses a light weight GL-5 in the front? Never heard much good about M1 Gear lube. I'd stick with a semi-syn or conventional. The GL additives do the protection, and dino is a good additive carrier. Most good dino 75w-XX pour at -40 or better.
 
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The only problem is most 75W gear oils are synthetics. I have never seen a mineral gear oil with a pour of -40F.

I don't know if Schaeffer's will cure your problem, but they do make good gear oils.
 
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Our family has put hundreds of thousands miles on M1 75-90 with no problems. Always very quiet.
 
Mobil 1 typically has the LS additive that can cause whining if your truck does not have a LSD. Make sure you bought the right Mobil 1 gear oil.

In the Xterra I never had an issue with the Mobil 1 w/LSD additive, but doesn't mean it won't cause a problem. Typically front diff's take a heavier weight gear oil to begin with and most recommend sticking with the mineral/conventional type of gear oils in the front diffs.
 
The Mobil gear oil is causing this problem seen it at least a hundred times . Try Chevron Delo ESI gear oil and I bet the whining goes away.
 
Some whine can be muffled with a thicker gear oil. The problem with synthetics is the they flow back too quickly. Think of the thickness of the gear oil surrounding the inside of the diff case as a sound insulator. So, step up the weight. Use a 75w110 or blend in 25-50% M1 75w140 to your next change.

http://www.amsoil.com/StoreFront/svt.aspx
http://www.mobil.com/USA-English/Lubes/PDS/GLXXENPVLMoMobil1_Synthetic_Gear_Lubricant_LS_75W-140.asp
http://www.mobil.com/USA-English/Lubes/PDS/GLXXENPVLMOMobil1_Synthetic_Gear_Lubricant_LS_75W-90.asp

Front diff's are 'rarely' under load and typically take a 'cheaper' gear oil and not a thicker gear oil.
 
Originally Posted By: Johnny
The only problem is most 75W gear oils are synthetics. I have never seen a mineral gear oil with a pour of -40F.

I don't know if Schaeffer's will cure your problem, but they do make good gear oils.
I wouldnt think a mineral would have a low pour either, but the Amalie 75w-90 GL-5 cheap jobber grade stuff I put in my Toyota has a pour of -45C, and so does their Elixer synthetic. Maybe they just dont charge $$$$$ for cat dewaxed oils and call them "synthetic" like everyone else
wink.gif
 
If the whine is purely oil related, is it going to cause a problem if I don't change it out. It isn't very loud so assuming that the whining doesn't get louder, I can live with it.
 
Originally Posted By: big_guy
Johnny said:
The only problem is most 75W gear oils are synthetics. I have never seen a mineral gear oil with a pour of -40F.

Shell Spirax EW Mineral Base Gear Oil, 75w-90 Pour point = -54 degree F. 80w-140 = -38 degrees F.


Shell Spirax EW (Eaton Warranty) 75W-90 is a synthetic gear oil.

Originally Posted By: ARCOgraphite
Change it. 80W-90 GL-5 Pennzoil.


Now this is something ARCOgraphite and I can agree 100% on. This is a very good mineral based gear oil.
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Originally Posted By: Johnny
big_guy said:
Johnny said:
The only problem is most 75W gear oils are synthetics. I have never seen a mineral gear oil with a pour of -40F.

Shell Spirax EW Mineral Base Gear Oil, 75w-90 Pour point = -54 degree F. 80w-140 = -38 degrees F.


"Shell Spirax EW (Eaton Warranty) 75W-90 is a synthetic gear oil."

***Ok not trying to but heads here Johnny.I know you are one of the few that really know there stuff. I would bet the farm I read somewhere the EW is mineral base. The Shell website does state it's synthetic? But it does not state it is mineral base either? I found a copy of an article that that states it is a mineral base oil. Looking for clarification here. Here is a copy of the article.

Spirax gear oils join Shell lubricant line
Jun 1, 2003 12:00 PM

Shell Lubricants has expanded its family of heavy-duty lubricants by adding the Spirax EW Extended Warranty SAE 75W-90 and 80W-140 gear oils. The new mineral-based gear oils meet the extended-warranty requirements of heavy-duty axles manufactured by Dana, ArvinMeritor, and Mack.

To gain the approvals, Shell subjected its lubricants to more than 50 million miles of field-testing under varied conditions and temperatures. Shell also conducted laboratory testing to qualify the Spirax EW lubricants under United States military specification MIL-PRF-2105E.

As a result, Spirax EW gear oils are now approved for 500,000-mile extended drain intervals for both Dana axles and ArvinMeritor axles equipped with pump and filter systems. The lubricants also are approved for use in Mack axles at 250,000-mile drains. The approvals allow fleets and independent truck operators to use Spirax EW gear oils for both service-fill and factory-fill at the same change interval specified for approved synthetic fluids, and still qualify for Dana and ArvinMeritor 750,000-mile extended warranty coverage.

Shell Spirax EW gear oils will be available in bulk, drums, kegs, pails, and quarts. Additional information is available at www.Shell-Lubricants.com.

*** Is this article full of poop? I am asking is it synthetic or mineral base? I'd really like confirmation here because I have been using this stuff with my Auburn thinking it is mineral base/
Click to expand...
Click to expand...
 
Originally Posted By: mechtech2
unDummy - You state to use a thicker gear oil, and also not to use a thicker oil?
Re read your post.


Separate paragraph and reason why many rear-ends get 75w90 when their counterparts in the front get 80w90, cause its cheaper on the assembly line. Rear diff is stressed always and front diff only when 4wd is in use. I said "typically take" and did not recommend thin gear oil EVER. Thin is for the MPG crowd.

LS additives, IMO, do not cause whining.

Re-read the whole thread as there is misinformation in it that I was commenting against.
 
The article is 50/50. The 75W-90 is a synthetic (Group III based) and the 80W-140 is a mineral (Group II based) product. When the 75W-90 was first introduced, it was a Group IV/PAO based product.

I guess according to some on here you could consider the Group III based a mineral product, but I do not.
 
This is an AWD so the front diff is stressed more than a 4WD (assuming mostly street use).
 
Originally Posted By: Johnny
The article is 50/50. The 75W-90 is a synthetic (Group III based) and the 80W-140 is a mineral (Group II based) product. When the 75W-90 was first introduced, it was a Group IV/PAO based product.

I guess according to some on here you could consider the Group III based a mineral product, but I do not.


Ok. Thanks for the info.
 
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