ST vs M1 And Other Gear Oil Info

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ka9mnx

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Some info I've gathered the past month. Upfront, SuperTech (Warren) synthetic has better spec's than Mobil1. Enjoy!


Pre 2001 Specs Post 2001 Specs

@100C @100C
w90 13.5-24 w90 13.5-18.5
w140 32.5-42 w140 24.4-32.5


SupertTech
Syn @100C @40C VI
w90 16.15 109.3 159
w140 27.64 171.8 200

Conv
w90 13.98 130.9 104
w140 26.39 347.7 100

Mobil1
Syn @100C @40C VI
w90 14.6 103 146
w140 24.4 170 175

Conv
w90 14.5 139 103
w140 25.4 333 99


GRADE AMBIENT TEMPERATURE RANGE
75W -40°F to -15°F (-40°C to -26°C)
75W-80 -40° to 80° (-40°C to 21°C)
75W-90* -40°F to 100°F (-40°C to 38°C)
75W-140 -40°F and above (-40°C and above)
80W-90 -15°F to 100°F (-26°C to 38°C)
80W-140* -15°F and above (-26°C and above)
85W-140 10°F and above (-12°C and above)
 
Might depend on how long you want to run it (long time is typical in a rear end) ... M1 140 is PAO ... and ST is ?
 
Put ST in wife's Subaru rear diff. Seems to be doing OK. Under 6 bucks a Qt.

Rear gears in normal passengers cars don't need anything "super-duper" synthetic as this app doesn't have combustion byproducts. contaminating the fluid. Traditionally low flash point Napthenic oils have been used, The EP additives are the special sauce.


That said, My Nissan dealer put Mobil HD80W90 in my 14 rogue TC and rear diff and it was terrible in the winter. OE fluids were mostly transparent ( as to their viscosity) on sub zero days where the new mobil fill was causing all kinds of problems in the DT. I cant beleive Nissan used 80w90 the rear diff of a 4 banger CUV.

Never a Mobil fan for pink syn grease OR diff fluid through the years.
 
Originally Posted by 4WD
Might depend on how long you want to run it (long time is typical in a rear end) ... M1 140 is PAO ... and ST is ?

10 > 20 % PAO. Whoop D Doo
smile.gif
 
You must have seen a different SDS ....and why are you always so cocky ?
 
Originally Posted by 4WD
You must have seen a different SDS ....and why are you always so cocky ?


Sorry, I just dislike Mobil gear oils. And PAO isnt a gear oil "savior" This is not motor oil.
Plus you said its PAO - which it IS NOT in the majority per the SDS I found.

Also I left Indiana in the 50's, lived in Jersey for a couple years then move to the Boston area




Product Name: MOBIL DELVAC 1 GEAR OIL 75W-140
Revision Date: 19 Nov 2015
Page 2 of 10
______________________________________________________________________________________________________________________
SECTION 3 COMPOSITION / INFORMATION ON INGREDIENTS
This material is defined as a mixture.
Hazardous Substance(s) or Complex Substance(s) required for disclosure
Name CAS# Concentration* GHS Hazard Codes
1-DECENE, HOMOPOLYMER HYDROGENATED 68037-01-4 10 - < 20% H304
OLEFIN SULFIDE 68937-96-2 1 - < 5% H227, H317, H413
PHOSPHORIC ACID ESTERS, AMINE SALT 1 - 2.5% H226, H302, H317,
H318, H401, H411

* All concentrations are percent by weight unless material is a gas. Gas concentrations are in percent by volume
 
Last edited:
Delvac and M1 90's run lower ... I posted this before and will look tomorrow ...
 
Originally Posted by rooflessVW
What about the ST is "better?"

It just looks thicker.

He must be weighting the VI high in the eval.

At least when "fresh" the ST will show sig better cold flow due to the moderately higher VI shpwing even though its KV40 is slightly higher than the Mobil product. That said the Mobil could possibly maintain its KV100 value longer in service than the ST ... depending ....
 
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