I have tried every Auto Parts store in my area, I have tried to search online and I have tried to search here. I can't seem to find anywere that sells Mobil 1 75w-140 gear lube. Everyplace I find only has the 75w-90 stuff. I really like the Mobil 1 products and I would like to keep my trucks juices all the same if I can. :) Any suggestions of an online site that I can buy this at? Or does anybodies local Auto store sell it? I'll pay ya to ship it to me if I have to. :D Thanks in advance. :)

That's a good question qwik because I've never seen it anywhere either. The only way I know it exists is because of M1's website!!

Well I did find this one site, but it seems way too expensive. It's $12.50 a quart and only available by the case. :(

http://store.avlube.com/mo1ls75sygeo.html

Have you tried asking one of your local stores if they can order it for you?

Have you tried asking one of your local stores if they can order it for you?

lol, ya know, I actually haven't tried that yet. :oops: I'll give that a shot and see what happens. :)

Well, just what I had figured..... I went to my two local Auto parts places, Advanced Auto and Auto Zone. I got the same response from both of them. "We only have what you see on the shelf, Why what is it for... Oh, you have to go to the dealer for that?" What BS! :evil: However, I noticed they had.. I think it was Valvoline, synthetic 75w-140 and it was $15.98 a quart. So I guess that online place for $12.50 for Mobil 1 isn't so bad. It just seems weird that the Mobil 1 75w-90 is only $7.99 a quart and the 75w-140 would be so much more. Oh well. :)

I need to add another possibility here concerning the 75W-140's. I just changed out my rear diff fluid the other day and drained Supertech synthetic 75W-140 that I bought at Wal-Mart for about $7/quart. That stuff looked great draining out. I only had 3K miles on it but I've never been able to see through the fluid before with less miles then that, even with the Mobil 1 75W-90!!! Had I known it was doing so well I certainly would have left it in there. Just another option to think about....

I need to add another possibility here concerning the 75W-140's. I just changed out my rear diff fluid the other day and drained Supertech synthetic 75W-140 that I bought at Wal-Mart for about $7/quart. That stuff looked great draining out. I only had 3K miles on it but I've never been able to see through the fluid before with less miles then that, even with the Mobil 1 75W-90!!! Had I known it was doing so well I certainly would have left it in there. Just another option to think about....
I hear ya, Mobil 1 has always been good to me so I don't like to stray if I don't have too. :) However, couldn't that just be because your diff is fully broken in now?

I need to add another possibility here concerning the 75W-140's. I just changed out my rear diff fluid the other day and drained Supertech synthetic 75W-140 that I bought at Wal-Mart for about $7/quart. That stuff looked great draining out. I only had 3K miles on it but I've never been able to see through the fluid before with less miles then that, even with the Mobil 1 75W-90!!! Had I known it was doing so well I certainly would have left it in there. Just another option to think about....
I hear ya, Mobil 1 has always been good to me so I don't like to stray if I don't have too. :) However, couldn't that just be because your diff is fully broken in now?

I would like to think that qwik but on my other Titan I had, I never drained out practically clear fluid in the 22K miles that I put on it. I don't like to stray either but heck, I can't dispute what I saw. I'm running Amsoils new Extreme Pressure 75W-90 right now because I couldn't get the -140 when I was ready to change it. I'll drain it out at 3K miles and see how it did and then probably go back with the supertech -140....

I found it at Pep Boys. It is very pricey though. I found the Royal Purple for about $1.50 less per bottle.

Sorry forgot to tell you what gear oil I'm talking about - Mobil 1 75w-140 gear lube

i found the M1 75-140 at a parts store called Murrays, they had it for 12.99 qt., and there 75-90 for 6.99 a qt.

I found an 85w-140 gear oil (forget the brand). It was all they had at my local parts store. What's the difference between 75w-140 and 85w-140?

I need to add another possibility here concerning the 75W-140's. I just changed out my rear diff fluid the other day and drained Supertech synthetic 75W-140 that I bought at Wal-Mart for about $7/quart. That stuff looked great draining out. I only had 3K miles on it but I've never been able to see through the fluid before with less miles then that, even with the Mobil 1 75W-90!!! Had I known it was doing so well I certainly would have left it in there. Just another option to think about....
I hear ya, Mobil 1 has always been good to me so I don't like to stray if I don't have too. :) However, couldn't that just be because your diff is fully broken in now?

I would like to think that qwik but on my other Titan I had, I never drained out practically clear fluid in the 22K miles that I put on it. I don't like to stray either but heck, I can't dispute what I saw. I'm running Amsoils new Extreme Pressure 75W-90 right now because I couldn't get the -140 when I was ready to change it. I'll drain it out at 3K miles and see how it did and then probably go back with the supertech -140....
Hmm, maybe I'll give that Supertech a shot then. I don't like to stray, but I am always open for improvement. :) Should I run the same lube in the front diff too?

I run 75W-90 in the front diff. I see no need to run a higher viscosity oil in the front diff when it sees next to no action, the fluid that comes out looks like it was just poured in as well.

I found an 85w-140 gear oil (forget the brand). It was all they had at my local parts store. What's the difference between 75w-140 and 85w-140?The difference is that the 75w has less viscosity (less thick) when cold then the 85W. The second number of 140 indicates the oil will have a higher viscosity or stay thicker under hotter operating conditions. Generally, thicker oil seals better and maintains a better film of lubrication between moving parts so that second higher number is good for our diffs, especially when towing. Thus when comparing 75w/140 to 85w/90 gear oils, the 75w/140 will be less viscous when cold, which is good until the diff heats up, and more viscous at higher temps, which is better for battling friction in the gears while driving.

By the way, I use 85w/140 also (Valvoline semi-synthetic). Since you are in Iowa where you have more freezing temps then So Cal, it might be better to switch to 75w/140 just to have that extra benefit for cold temps.

I am having the same problem finding the Mobil lube... I think I will give Supertech a shot as well... I will leave it in for about 5k and then we can compare our results.... btw... can we get the Diff lube tested as well?

I am having the same problem finding the Mobil lube... I think I will give Supertech a shot as well... I will leave it in for about 5k and then we can compare our results.... btw... can we get the Diff lube tested as well?

You sure can through blackstone but I have no idea how to interpret the results. I'll do some looking on bobistheoilguy site and see if anyone else has sent a sample in. Mostly you'll see just engine oil samples there and a few ATF samples scattered about. I'll do some research and get back with you.

Ok, there's only 2 gear oil samples on that whole site but it does give us somewhat of a baseline. Go for it and let us know what the results are!!

I just picked up some SuperTech Full Synthetic 75/140 from Walmart. It was $8.82/quart, rated for high pressure and heavy duty applications.

I think the supertech will do fine...it's better than too little oil, for sure.

btw... from what i've been reading and was told, Supertech is a Quaker State product. Basically, QS is doing some re-packaging for Walmart. interesting!

btw... from what i've been reading and was told, Supertech is a Quaker State product. Basically, QS is doing some re-packaging for Walmart. interesting!
You just took the question right out of my mouth! lol :D

I made a contacted QS for confirmation and also requested a tech data sheet for the 75w/140... As soon as I get feed back I will make a post!

I made a contact at QS for confirmation and also requested a tech data sheet for the 75w/140... As soon as I get feed back I will make a post!

Now we're talking!!! Oh how I love this talk.... :learn:

Just out of curiosity, how much is Nissan's 75-140 full synthetic? Is there any reason not to go with this? I'm looking at doing the sort-of-group-buy for the finned rear diff cover here, seems like using the OEM stuff would avoid any potential debate in the unlikely event that the rear end blew out whilst under warranty ...

I found an 85w-140 gear oil (forget the brand). It was all they had at my local parts store. What's the difference between 75w-140 and 85w-140?The difference is that the 75w has less viscosity (less thick) when cold then the 85W. The second number of 140 indicates the oil will have a higher viscosity or stay thicker under hotter operating conditions. Generally, thicker oil seals better and maintains a better film of lubrication between moving parts so that second higher number is good for our diffs, especially when towing. Thus when comparing 75w/140 to 85w/90 gear oils, the 75w/140 will be less viscous when cold, which is good until the diff heats up, and more viscous at higher temps, which is better for battling friction in the gears while driving.

By the way, I use 85w/140 also (Valvoline semi-synthetic). Since you are in Iowa where you have more freezing temps then So Cal, it might be better to switch to 75w/140 just to have that extra benefit for cold temps.

Thanks, Cal!

Just out of curiosity, how much is Nissan's 75-140 full synthetic? Is there any reason not to go with this? I'm looking at doing the sort-of-group-buy for the finned rear diff cover here, seems like using the OEM stuff would avoid any potential debate in the unlikely event that the rear end blew out whilst under warranty ...

Two good reasons: I've heard it's about $10 more per quart. I'll never buy OEM oil 1) It's waaaay (ridiculously) too expensive 2) there's much better oil out there.

If my rearend blows with the (updated) recommended viscosity in it, I'll make sure they have a very hard time denying my warranty. Especially since Nissan was the one that put in the 'wrong' viscosity, in the first place.

The unlikely event will be out of their pocket, until I hit 60k miles.

I have seen the OEM stuff as high as $18 per quart...

The only 75W-140 I have found is Valvoline at Advance Auto and it was close to $15 per quart. I think I will do the same and use the SuperTech at $9 per quart and check it at 3k miles.

The only 75W-140 I have found is Valvoline at Advance Auto and it was close to $15 per quart. I think I will do the same and use the SuperTech at $9 per quart and check it at 3k miles.

I'm going to keep an eye on it also. There's enough left in that third quart to refill after a little test sample at my next oil change.

Okay... got the feedback from QS regarding Supertech and this is what they confirmed...

Quote: Quaker State contract blends this product and provides technical support for Super Tech products. Walmart owns the formulations.

They also sent me the Tech Data sheet which I copied over for your viewing...



GL-5 GEAR OILS


Meets MIL-PRF-2105E
Meets API Service Category GL-5 and MT-1
Meets Mack GO-J, GO-H

PRODUCT DESCRIPTION
SUPER TECH™ GL-5 GEAR OIL is a multi-purpose extreme pressure gear lubricant recommended for make-up or refill of manual shift transmissions, conventional differentials, rear axles and steering gear boxes as found in passenger cars, trucks and farm tractors, where API GL-5 or MT-1 lubricants are specified.

Can be used for makeup of Limited Slip/Positive Traction rear axles.

 Protects against rust and foam
 Protects against corrosion of copper and bronze bushings

SUPER TECH™ GL-5 GEAR OILS are formulated to meet the performance requirements of MIL-L-PRF-2105E, API GL-5 and MT-1, and Mack GO-J.

PRECAUTIONS
The petroleum hydrocarbons used in these products have been severely hydrotreated and/or solvent refined. These products also include a special blend of additives, which contain a component suspected of causing skin sensitization, and have been evaluated as potentially hazardous. Good hygiene, which includes regular washing of skin with soap and water, frequent changing of soiled clothing, and the use of impermeable gloves, should be used to avoid possible skin irritation and/or sensitization. Avoid the generation of mists. If SUPER TECH™ GL-5 GEAR OILS contact the eyes, flush with large amounts of fresh water for 15 minutes or until the irritation subsides.

WARNING
“Empty” containers retain residue (liquid and/or vapor) and can be dangerous. Do not pressurize, cut, weld, braze, solder, drill, grind, or expose such containers to the heat, flame, sparks, or other sources of ignition; they may explode and cause injury or death. “Empty” drums should be completely drained, properly bunged, and promptly returned to a drum reconditioner. Additional health and safety information may be obtained from the Material Safety Data Sheets (MSDS) available from Environmental Health and Safety at 1-800-546-6227.



TYPICAL PHYSICAL AND CHEMICAL PROPERTIES
SUPER TECH™ GL-5 GEAR OILS


TEST TYPICAL RESULTS

SAE Grade 80W-90 85W-140
API Service GL-5 & MT-1 GL-5 & MT-1
API Gravity 26.0 25.0
Flash Point, COC, °C (°F) 210 (410) 210 (410)
Fire Point, COC, °C (°F) 226 (440) 226 (440)
Pour Point, °C (°F) -26 (-15) -18 (0)
Viscosity
@ 40°C, cSt 140 352
@ 100°C, cSt 14.5 26.5
@ 100°F, SUS 733 1873
@ 210°F, SUS 77.6 131
Viscosity Index 100 100
Brookfield Viscosity, cP Max
@ -26°C(-15°F) 150,000 -
@ -12°C(+10°F) - 150,000
Timken OK Load, lbs. 70 70
Material Number
6/1 quart 56447 56448
4/1 gallon 91103 91091
35 lb pail 715313

Okay... got the feedback from QS regarding Supertech and this is what they confirmed...

Quote: Quaker State contract blends this product and provides technical support for Super Tech products. Walmart owns the formulations.

They also sent me the Tech Data sheet which I copied over for your viewing...



GL-5 GEAR OILS


Meets MIL-PRF-2105E
Meets API Service Category GL-5 and MT-1
Meets Mack GO-J, GO-H

PRODUCT DESCRIPTION
SUPER TECH™ GL-5 GEAR OIL is a multi-purpose extreme pressure gear lubricant recommended for make-up or refill of manual shift transmissions, conventional differentials, rear axles and steering gear boxes as found in passenger cars, trucks and farm tractors, where API GL-5 or MT-1 lubricants are specified.

Can be used for makeup of Limited Slip/Positive Traction rear axles.

 Protects against rust and foam
 Protects against corrosion of copper and bronze bushings

SUPER TECH™ GL-5 GEAR OILS are formulated to meet the performance requirements of MIL-L-PRF-2105E, API GL-5 and MT-1, and Mack GO-J.

PRECAUTIONS
The petroleum hydrocarbons used in these products have been severely hydrotreated and/or solvent refined. These products also include a special blend of additives, which contain a component suspected of causing skin sensitization, and have been evaluated as potentially hazardous. Good hygiene, which includes regular washing of skin with soap and water, frequent changing of soiled clothing, and the use of impermeable gloves, should be used to avoid possible skin irritation and/or sensitization. Avoid the generation of mists. If SUPER TECH™ GL-5 GEAR OILS contact the eyes, flush with large amounts of fresh water for 15 minutes or until the irritation subsides.

WARNING
“Empty” containers retain residue (liquid and/or vapor) and can be dangerous. Do not pressurize, cut, weld, braze, solder, drill, grind, or expose such containers to the heat, flame, sparks, or other sources of ignition; they may explode and cause injury or death. “Empty” drums should be completely drained, properly bunged, and promptly returned to a drum reconditioner. Additional health and safety information may be obtained from the Material Safety Data Sheets (MSDS) available from Environmental Health and Safety at 1-800-546-6227.



TYPICAL PHYSICAL AND CHEMICAL PROPERTIES
SUPER TECH™ GL-5 GEAR OILS


TEST TYPICAL RESULTS

SAE Grade 80W-90 85W-140
API Service GL-5 & MT-1 GL-5 & MT-1
API Gravity 26.0 25.0
Flash Point, COC, °C (°F) 210 (410) 210 (410)
Fire Point, COC, °C (°F) 226 (440) 226 (440)
Pour Point, °C (°F) -26 (-15) -18 (0)
Viscosity
@ 40°C, cSt 140 352
@ 100°C, cSt 14.5 26.5
@ 100°F, SUS 733 1873
@ 210°F, SUS 77.6 131
Viscosity Index 100 100
Brookfield Viscosity, cP Max
@ -26°C(-15°F) 150,000 -
@ -12°C(+10°F) - 150,000
Timken OK Load, lbs. 70 70
Material Number
6/1 quart 56447 56448
4/1 gallon 91103 91091
35 lb pail 715313

Can I get a translator please. Is this good or bad?
How does this compare to Mobile 1?

Yeah what he said. :D Oh JetTech...... translation please. :) Is this stuff good?

Perhaps, we should get a tech data sheet from mobil 1 and compare the two...

Perhaps, we should get a tech data sheet from mobil 1 and compare the two...

:notworthy:

Here is the Mobil 1 Data Sheet...

Specifications & Approvals

Mobil 1 Synthetic Gear Lubricant LS meets or exceeds the following industry specifications:
75W-140
API GL-5 X


Typical Properties

Mobil 1 Synthetic Gear Lubricant LS

SAE Grade 75W-140
Viscosity, ASTM D 445
cSt @ 40ºC 179
cst @ 100ºC 25.3
Viscosity Index, ASTM D 2270 175
Pour Point, ºC, ASTM D 97 -51
Flash Point, ºC, ASTM D 92 221
Density @ 15ºC kg/l, ASTM D 4052 0.863

It looks like these are for different weights? The Supertech specs are for 80w90 and 85w140 and the Mobil1 specs are for 75w140? Actually, the viscosity specs for different brands of the same weight should be the same, right? The weight of the oil determines the viscosity.

let me see if QS can send me a sheet for the 75w...

Okay, just got a call from a tech at QS(Shell) and he told me that he was unaware of the 75w being sold at Walmart and said there are very slight differences from the 75w and the 85w... And actually go off of the 85w sheet since the differences are insignificant. Apparently, the 75w is a new stocking item for Walmart.... If you guys need more info, I can give you the tech name and email address...

LOL, I can compare the two all day long..... But I still don't know what it all means. :) I need the translated version. :D

I hear ya! we need a chemist! :informative:

You can't really do a true comparison if the supertech tech data sheet is for another grade. Look at the pour point, it's much higher then the Mobil 1 is because the supertech is 80 or 85 weight to start with. We can really only do an apples to apples comparison if we can get our hands on the tech data sheet for the 75W-140.

Just changed the factory Diff oil this past weekend (3500 miles)... typical dark grey, stinky stuff... Had some shavings along with some nasty pasty buildup on the plug. Anyways, I replaced it with the Supertech 75w/140... I will leave it in for 5k and let you all know the outcome when I change it...

Just changed the factory Diff oil this past weekend (3500 miles)... typical dark grey, stinky stuff... Had some shavings along with some nasty pasty buildup on the plug. Anyways, I replaced it with the Supertech 75w/140... I will leave it in for 5k and let you all know the outcome when I change it...
I guess I am going to have to drain mine now. I was hoping that the 05's would dodge this bullet. It's too easy to drain and check like you have.
I have 2500 miles and will go to Walmart and get the Supertech 75W/140. Blackstone has a good article on name brand oil at http://www.blackstone-labs.com/which_oil_to_use_.html. I have also ordered a kit to have mine evaluated to get a bench mark. It's seems that a little PM now will eliminate some issues later on.

Just got back from Walmart to buy the Supertech. I spent 20 minutes searching and could not find it save my life! I found 80w90 and 85w140 Dino but could not find the 75w140 synthetic. Well, after searching high and low I find this clearance section and there it was..... 7 quarts of SuperTech 75w-140 synthetic gear oil! :) It was on clearance, I don't know why???? So I bought all 7 for $5 each. :) I wonder why it is on clearance? Maybe just that location... I'll have to check another Walmart next time I'm near one. But anyway, I got enough to do the front and rear diff's. I was gonna just use the 75-90 stuff for the front but at that price I guess it won't matter. :) On a side note, SuperTech has a 5w-30 full synthetic motor oil for under $12 for 5 guarts. What do ya think Jet?? Is that worth a test for ya?? :D

On a side note, SuperTech has a 5w-30 full synthetic motor oil for under $12 for 5 guarts. What do ya think Jet?? Is that worth a test for ya?? :D

I don't see where it would hurt. Their synthetic is a group III if I'm not mistaken but heck, at that price why not...

Yes, Walmart is taking over the world. I'm going this weekend to get my 75w-140. We have two (two!) so surely one of them has it.

I had to look around the shelves for it as well... they don't stockl it next to the other gear oils...

I just ordered 2qts of redline 75-140 from advanced auto parts for a little under 10.00 per not to shabby, have m175-90 in now, but if nissan is recomending 75-140 syn thats more than fine by me...

Well I finally found MOBIL 1 75-140W in my area!!. I found it tonight at PEP BOYS AUTO PARTS for $14.99 a quart. I'm not sure if PEP BOYS is a nationwide chain or just a east coast chain,,,,,,,GOOD LUCK!