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#4705895 - 03/24/18 10:33 PM Store brand 75w90 vs name brand?
presta24 Offline


Registered: 08/07/11
Posts: 6
Loc: Cincinnati
I wheel 8 or 10 times a year and change my diff oils once a year regardless of mileage. Since I change it so often is there a benefit to running a more expensive brand?

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#4705914 - 03/24/18 10:51 PM Re: Store brand 75w90 vs name brand? [Re: presta24]
dlundblad Offline


Registered: 09/30/13
Posts: 10190
Loc: Indiana
You're good to go with the store brand unless you need a limited slip additive.
_________________________
03 Jeep WJ 4.0 199k Castrol Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 177k M1 0w40 Mahle OX149D
97 Chevy Blazer 4.3 149k Rotella T5 10w30 Supertech ST3980


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#4705948 - 03/24/18 11:35 PM Re: Store brand 75w90 vs name brand? [Re: presta24]
Nyogtha Offline


Registered: 10/13/14
Posts: 2337
Loc: San Antonio, TX
Even then, the Carquest 75W-140 I picked up on sale recently at AAP states it has LS additive blended in, so it depends on which store brand oil you buy. Super Tech at Walmart has no LS additive blended in.
_________________________
"No matter how paranoid you are you're not paranoid enough. Tell the truth. Reach as many people as you can with it. That's your weapon." - Susanne Modeski, aka "Holly" to The Lone Gunmen

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#4706009 - 03/25/18 04:31 AM Re: Store brand 75w90 vs name brand? [Re: presta24]
skyactiv Offline


Registered: 03/02/13
Posts: 4497
Loc: The Midwest
I used Supertech semi synthetic 75W90 well over 100K in a WRX manual transmission. The 5 speeds in the WRX's were
nick named glass transmission because they were fragile. Google "glass transmission". I never had an issue, even after I did a stage 2 tune
for mid 13 second 1/4 mile times.
_________________________
Wife: 15' Audi A4 quattro 6 speed manual
Me: 13' VW GTI 3 door 6 speed manual

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#4706017 - 03/25/18 05:13 AM Re: Store brand 75w90 vs name brand? [Re: presta24]
GMguy84 Offline


Registered: 07/14/17
Posts: 270
Loc: OKLAHOMA
Just changed the DIFF fluid in my Suburban and it called 75W-90


Luckily, I scored the last case of walmart Super tech FULL SYN for $22.50 w/tax !!!! I think it was the last case of FULL SYN for that price in oklahoma cause I saw at other stores was semi-syn laugh lol


Does anyone know who makes the DIFF fluid for Wal-Mart ??

Dave


Edited by GMguy84 (03/25/18 05:21 AM)
_________________________
05 Silverado Z71 5.3 DELO 400 XLE 10W30/FUG XG3675

01 Suburban 5.3 Mobil 1 HM 10W40/M1206A

1982 TRANS AM (KITT) Mobil Super 5K HM 10W40/M1302A

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#4706018 - 03/25/18 05:28 AM Re: Store brand 75w90 vs name brand? [Re: presta24]
TriaxLubes Offline


Registered: 04/28/17
Posts: 3
Loc: Texas
Yes, there are significant advantages to using high performance gear oils all the time, even though you change it often. Not all gear oils offer the same level of protection, even for very short drain intervals. Just because two gear oils are both 75W90 with the same specs doesnt mean they are the same. Both being 75W90 has about as much meaning as saying two cars are red so they must be the same and will pick the cheapest one...its not true.

Additive and viscosity breakdown due to shear and load can happen very quickly. The quality of the gear oil comes down to the base oils used, VI improvers, EP additives etc. For example, you can make a cheap gear oil by using lower quality base oil and a lot of Viscosity Index Improvers (VI). Its a way to keep cost down vs using a high grade base oil with very high natural VI, like a Group III or PAO. The latter option is by far the best but tends to be more expensive. To make a great gear oil, you must keep the use of VI improvers down to a minimum, as VI improvers are prone to shear. So just because you change your gear oil often doesnt mean you get the same protection in that short time you do use it. Just like using poor quality motor oils. Short drain intervals WILL NOT save you from premature engine wear and other issues as the poor quality oil does not protect the metal like more expensive / better oils and will generate a ton of sludge in that short 3000 miles. Due to the complexity of lubricants engineering, its nearly impossible to tell how things are made. Having an oil meet certain criteria like GL-5, SN, API approval or whatever, doesnt say much about performance since these standards are not exactly top tier. They are a very low minimum requirement. Best way to evaluate it is to look for mentions of drain intervals and the number of OEM specs it meets. Drain intervals are pretty good indicator of quality.

Top tier gear oils meet or exceed EATON Roadranger or EATON E500 - these two specs are very hard (expensive) to meet. These are 750,000 miles gear oils. Its not the drain interval that matters really, what matters is the quality which goes into the product and is required to even approach that kind of performance. I think you will find only a handful of gear oils meet those specs, probably less than 1% of whats on the market.

A good rule of thumb is to always buy the best you can afford. If you are going to use a 75W90, use a full synthetic. Never a synthetic blend. There is no law that regulates what manufacturers can call a synthetic blend. It can be 1% synthetic and 99% mineral or 20% synthetic and 99% mineral. No way to tell.


Edited by TriaxLubes (03/25/18 05:29 AM)

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#4706031 - 03/25/18 06:07 AM Re: Store brand 75w90 vs name brand? [Re: presta24]
Lubener Offline


Registered: 01/22/11
Posts: 2608
Loc: N.Ohio
Changing gear oil once a year is likely overkill. As often as you do it, it wouldn't matter brand or anything else as long as it meets the specs for your vehicle.
_________________________
The "thinking" man's friend.

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#4706063 - 03/25/18 07:52 AM Re: Store brand 75w90 vs name brand? [Re: presta24]
Jimzz Offline


Registered: 10/03/14
Posts: 1170
Loc: NoVA
I've used a lot of Supertech 75w90 gear oil. Its rated synthetic now as it was recently updated. As said no mention of a LS additive if you need that.
Around $5 a bottle can't be beat.
_________________________
yup

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#4706074 - 03/25/18 08:04 AM Re: Store brand 75w90 vs name brand? [Re: TriaxLubes]
john_pifer Offline


Registered: 07/08/12
Posts: 2030
Loc: Nashville, TN via Memphis
Originally Posted By: TriaxLubes
Yes, there are significant advantages to using high performance gear oils all the time, even though you change it often. Not all gear oils offer the same level of protection, even for very short drain intervals. Just because two gear oils are both 75W90 with the same specs doesnt mean they are the same. Both being 75W90 has about as much meaning as saying two cars are red so they must be the same and will pick the cheapest one...its not true.

Additive and viscosity breakdown due to shear and load can happen very quickly. The quality of the gear oil comes down to the base oils used, VI improvers, EP additives etc. For example, you can make a cheap gear oil by using lower quality base oil and a lot of Viscosity Index Improvers (VI). Its a way to keep cost down vs using a high grade base oil with very high natural VI, like a Group III or PAO. The latter option is by far the best but tends to be more expensive. To make a great gear oil, you must keep the use of VI improvers down to a minimum, as VI improvers are prone to shear. So just because you change your gear oil often doesnt mean you get the same protection in that short time you do use it. Just like using poor quality motor oils. Short drain intervals WILL NOT save you from premature engine wear and other issues as the poor quality oil does not protect the metal like more expensive / better oils and will generate a ton of sludge in that short 3000 miles. Due to the complexity of lubricants engineering, its nearly impossible to tell how things are made. Having an oil meet certain criteria like GL-5, SN, API approval or whatever, doesnt say much about performance since these standards are not exactly top tier. They are a very low minimum requirement. Best way to evaluate it is to look for mentions of drain intervals and the number of OEM specs it meets. Drain intervals are pretty good indicator of quality.

Top tier gear oils meet or exceed EATON Roadranger or EATON E500 - these two specs are very hard (expensive) to meet. These are 750,000 miles gear oils. Its not the drain interval that matters really, what matters is the quality which goes into the product and is required to even approach that kind of performance. I think you will find only a handful of gear oils meet those specs, probably less than 1% of whats on the market.

A good rule of thumb is to always buy the best you can afford. If you are going to use a 75W90, use a full synthetic. Never a synthetic blend. There is no law that regulates what manufacturers can call a synthetic blend. It can be 1% synthetic and 99% mineral or 20% synthetic and 99% mineral. No way to tell.


Sounds an awful lot like an oil salesman.
_________________________
16 WRX - PPPP
07 Tacoma V6 - M1 EP 5W-30, Fram Ultra, 10K OCIs, 198K
07 Yamaha R1 - Rotella T6 5W-40, Bosch 3300
07 Yamaha YZ-250, Klotz, Rotella


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#4706088 - 03/25/18 08:21 AM Re: Store brand 75w90 vs name brand? [Re: Lubener]
presta24 Offline


Registered: 08/07/11
Posts: 6
Loc: Cincinnati
I change it so often only due to the risk of water seeping into the cases. We do a lot of deep water crossings.

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#4706091 - 03/25/18 08:22 AM Re: Store brand 75w90 vs name brand? [Re: Lubener]
presta24 Offline


Registered: 08/07/11
Posts: 6
Loc: Cincinnati
Originally Posted By: Lubener
Changing gear oil once a year is likely overkill. As often as you do it, it wouldn't matter brand or anything else as long as it meets the specs for your vehicle.


I change it so often only due to the risk of water seeping into the cases. We do a lot of deep water crossings.

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#4706098 - 03/25/18 08:24 AM Re: Store brand 75w90 vs name brand? [Re: presta24]
presta24 Offline


Registered: 08/07/11
Posts: 6
Loc: Cincinnati
Thanks for all the feed back guys. Last time I changed my front diff I must have reused the crush washer instead of replacing it and it was leaking. So when I replaced the crush washer I just refilled with super-tech syn. No LS required for the front diff or xfer case, only the rear diff.

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#4706220 - 03/25/18 10:23 AM Re: Store brand 75w90 vs name brand? [Re: presta24]
andyd Offline


Registered: 09/25/04
Posts: 7273
Loc: Marshfield , MA
If the cheap stuff "meets or exceeds" the specced lube grade... I read the bottles when I compare a name brand to the cheap stuff.
_________________________
'16 Camry LE STP synth 0w20 and STP filter. the Fridge

1994 Ranger ,the Rat, 5w30 dino, STP filter

'16 Camry SE, Valvoline HM 0w20 and OEM filter
Thick oil is better grin2

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#4706320 - 03/25/18 12:26 PM Re: Store brand 75w90 vs name brand? [Re: presta24]
Snagglefoot Offline


Registered: 12/31/17
Posts: 1908
Loc: SE British Columbia, Canada
This is what is in my 3/4 ton diffs. It's the Canadian Tire store brand. It is good enough or do I need to worry about PAO and stuff. wink



MotoMaster Synthetic Extreme Pressure Gear Oil is recommended for differentials and manual transmissions for which hypoid-type lubricants are required
Transfer cases for heavy equipment trucks, tractors, industrial gear drives, automobiles, farm machinery, etc.
Meets or exceeds API Service Classification GL-5 and MT-1 and SAE J2360; former U.S. Military Specification MIL-L-2105D and MIL-PRF-2105E performance requirements
Meets or exceeds Scania STO 1:0, Eaton Road Ranger E500 and ArvinMeritor O-76N performance requirements
Meets DANA SHAES 256, Rev. C (75W-90) and Mack GO-J Plus (75W-90) requirements
Grade: 75W90


Edited by Snagglefoot (03/25/18 12:26 PM)

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#4706333 - 03/25/18 12:42 PM Re: Store brand 75w90 vs name brand? [Re: TriaxLubes]
4WD Offline


Registered: 09/21/10
Posts: 6532
Loc: Texas
I for one have experienced gear oil break down (Shell bulk dino) ~ drained out like hydraulic oil in 30k lost the whole rear end just past warranty $1800 later I had a used rear end with 20k more than the truck had
That pumpkin was filled with Schaeffer synthetic

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