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#985350 - 09/09/07 08:59 PM
Gear Oil - in a nut shell
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blackdiamond
Registered: 03/05/07
Posts: 418
Loc: Western Washington
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I've been on the forum for a while now and have mostly been focused on engine oil, but am interested in gears oils as well.
I think I read that there are a couple of key additives the differentiate gear oil from motor oil, along with viscosity, that also give it the distinctive smell.
Please give me the nuts and bolts of gear oil in a nut shell.
Yesterday I purchased some Valvoline 80w-90 Blend that I am planning to put in my 4Runner dual transfer case. The full synthetic seems too expensive and I'm not convinced that it makes as much difference as it might with motor oils.
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#985351 - 09/09/07 10:16 PM
Re: Gear Oil - in a nut shell
[Re: blackdiamond]
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surfstar
Registered: 09/16/04
Posts: 2048
Loc: Santa Barbara, CA
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Full syn is good for trannies and diffs. The fluid is rarely changed compared to motor oil, so why not spend the extra $$ every 30-60k miles? Plus you get that extra .01% MPG.
Phosphorus makes up a good bit of the smell IIRC.
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Ethics are so annoying. I avoid them on principle. -Bucky Katt
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#985352 - 09/10/07 01:53 AM
Re: Gear Oil - in a nut shell
[Re: surfstar]
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MolaKule
Registered: 06/05/02
Posts: 10019
Loc: Midwest
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#985354 - 09/10/07 02:55 AM
Re: Gear Oil - in a nut shell
[Re: MolaKule]
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blackdiamond
Registered: 03/05/07
Posts: 418
Loc: Western Washington
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Thanks!
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Dyson Analysis Customer
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#985355 - 09/10/07 03:08 AM
Re: Gear Oil - in a nut shell
[Re: blackdiamond]
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Steve S
Registered: 01/20/03
Posts: 11724
Loc: Redding Kali. For .Nia
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Quote:
I'm not convinced that it makes as much difference as it might with motor oils.
Differential and transmissions are the best use of synthetic oils.There are many more factory recommendation and fills for syn oil in differentials and transmissions than for motors. Although a favorite gear oil considering performance and price is Delo ESI gear oil. Probably outperforms most syn oils and costs less .That oil is my choice for non syn recommended gear oils.
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Remember if you get something from the government it was taken from someone else.
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#985356 - 09/10/07 03:21 AM
Re: Gear Oil - in a nut shell
[Re: Steve S]
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Panzerman
Registered: 12/16/06
Posts: 964
Loc: Daytona, Florida
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I am not a pro synthetic person, but do think that gear oil is where it would really shine. Less drag, less heat, less shearing and extended drains are where this oil would be so much better than conventional lube. Motor oils have to deal with combustion gas's, soot and acids, therefore Iam not a fan of extenced drains there.
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#985357 - 09/10/07 08:25 AM
Re: Gear Oil - in a nut shell
[Re: Panzerman]
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mechtech2
Registered: 09/05/06
Posts: 5504
Loc: Chicago Area
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The distinctive smell was usually sulfur, which under pressure made sulfur oxide on iron and steel gears.
It was for hardening and wear.
There are new types available, and synthetics are a very good idea for trannys, rear ends, and differential cases.
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#985358 - 09/10/07 03:23 PM
Re: Gear Oil - in a nut shell
[Re: mechtech2]
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Jim Allen
Registered: 08/12/05
Posts: 827
Loc: NW Ohio
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I agree with SteveS. In an NP205 gear-drive t-case (with a Doubler atached, also gear drive), you can actually FEEL the difference when do a coast down test. I noted lower oil temps as well (as read with a .
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Jim Allen
Keepin' the Good Old Days of Four Wheeling Alive
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#985359 - 09/10/07 07:41 PM
Re: Gear Oil - in a nut shell
[Re: Jim Allen]
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mechtech2
Registered: 09/05/06
Posts: 5504
Loc: Chicago Area
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We have come a long way since Henry Ford spec'd 600W gear oil for his early differential units!
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