M1 75w90 GL5 - cst range

[heffergm]

Guys,
Was hoping someone might have this information:

M1 75w90 has a cst @ 100ºC of 15.2.

What I'm trying to figure out is if that's on the low range of the scale for a 90w or not.

I ask because my car is spec'd for a 75w85 GL5, which is virtually impossible to get ahold of (and I have my doubts that the dealership would use the correct oil).

I'll probably end up running the M1 75w90 regardless, but if it falls on the light end of the 90w scale, I'd feel even better about it

 

[gtx510]

I'd guess towards the low end.
www.bobistheoilguy.com/visc.html


A 75W85 GL-5? Is there such a thing?
M1 75W90 will work fine if it's not a tranny and will just protect more.


fwiw, Liqui-Moly 75W90 has an advertised viscosity of 14.4 cSt @ 100C, I think that's the thinnest I could find.

 

[unDummy]

SAE J306:
http://www.lubrizol.com/AutomotiveGearOil/j306_spec.asp

API GL5:
http://www.lubrizol.com/AutomotiveGearOil/GL5.asp
http://swri.edu/4org/d08/Abstracts/GearOil.pdf#search="SAE J2360 "

Now available, thinner oils(MPG) for rearend usage. Since gear oils range from 80-250, its about time that GL5 protection level is brought down to the lighter weights.

 

[heffergm]

Thanks. Yeah, Lexus specs a Toyota synthetic 75w85 GL5 for the Lexus IS350 diff.

 

[shanneba]

I recently compared several 75w-90 gear oils also looking for a lower viscosity. I went with the Motul Gear 300.

Here are the ones I compared:

code:

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75w-90 Gear oils specs gathered 08-2006



Motul 300 Motul Castrol Mobil 1 Red Line Castrol

MotylGear SAF-XO Syntec



GL4 GL5 GL4 GL5 GL5 GL-5/MT-1 GL5+ GL-5/MT-1

MIL-L-2105D MIL-L-2105D





Vis 40C 72.6 81 103.7 106 115

Vis 100C 15.2 14.5 15.7 15.2 16.4 15.0

VI 222 188 162 150 155

Pour pt C -60 -48 -51 -46 -45

Flash Pt C 200 200 220 175 227 198

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[gtx510]

fwiw, I think Lubrizol is the parent company of Liqui-Moly?
www.motorspot.com sells Motul
www.*********.com sells Redline