Motul Gear 300 & HPL Differential Life 75W-90 VOA comparison!

SubieRubyRoo said:
This is gonna be lit! May even need a new, separate thread to put all the new info into. Try to beat 11/9 as that’s my face-to-face with the lab to deliver samples 👍🏻
Click to expand...
The most interesting sample I’m gonna send ya is a quart of Shell Spirax 80w-90
It’s synthetic
Price is cheap compared to other synthetic brands
 
from what I’ve been told, Ford uses its Motorcraft 75w85 across MANY of its trucks and cars. That’s a big inventory Of vehicles on the road. So testing a sample of that might have big bang for the many many readers. It would satisfy the itch to learn how much better the foo-foo oils are vs factory, and how much different they are from 75w90. Not sure if Motorcraft would be representative of Mopar, Toyota, or GM equivalents. Also a sample of 75w110 (and I vote Amsoil Severe Gear) would also be interesting to differentiate these from the allegedly “too thin after the grade specs were altered” 75w90’s. Or Redline, or evidently HPL now makes a 75w110, from what I inferred above.

I wish an Eaton rep would chime in and tell us what parameter makes good in their Tru-Trac (Torsen). It pisses me off they have actual specs/standards for other gear fluids but just the lame “Dino good and Synthetic bad“ verbiage for the Tru-Trac…with no quantifiable justification. I mean how much friction do they need, and how bad is that friction for everything else the fluid touches? But lacking that input from Eaton, would you test a Dino 80w90? if so, I’ll pitch in a quart of MasterPro or SuperTech Dino,or maybe even Lucas if I can find it just so we know how much different From the foo-foo’s. (Generally I prefer foo-foo myself, though Eaton prefers Dino 80w90 for their Torsen, hence the interest)

I’ll PM you @SubieRubyRoo on how to get it to you, if you're open to that. Could be a contrast to the Spirax (synthetic) Ford250 is sendingyou.
 

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Ok all, @ford250 has broken the supply chain! This series of 75w90 testing will be grinding to a halt with the return of the lab results… thanks to ford250 and the previously mentioned donors, we will have 6 additional 75w90s tested, bringing us to 11 total.

Ford250: Shell Spirax 75w90 GL-5 MT-1
Subaru High Performance 75w90 (Idemitsu)
Ultra Plus 75w90 GL-5
AC Delco Dexron 75w90 GL-5

And the previously sent:
Valvoline Synpower 75w90 GL-4, GL-5, MT-1

Ravenol VSG 75w90 GL-4 GL-5

I will post these 6 gear oils in their own thread and carry over the chart from this thread to tie it all together.
 
SubieRubyRoo said:
Ok all, @ford250 has broken the supply chain! This series of 75w90 testing will be grinding to a halt with the return of the lab results… thanks to ford250 and the previously mentioned donors, we will have 6 additional 75w90s tested, bringing us to 11 total.

Ford250: Shell Spirax 75w90 GL-5 MT-1
Subaru High Performance 75w90 (Idemitsu)
Ultra Plus 75w90 GL-5
AC Delco Dexron 75w90 GL-5

And the previously sent:
Valvoline Synpower 75w90 GL-4, GL-5, MT-1

Ravenol VSG 75w90 GL-4 GL-5

I will post these 6 gear oils in their own thread and carry over the chart from this thread to tie it all together.
Click to expand...
The Subaru sample is just for you !!
 
Impatient said:
@SubieRubyRoo And??? If in different thread, please provide link
Click to expand...
Still waiting. Will reach out Tuesday to see where everything is at. Do remember that this level of testing is quite time- and labor-intensive for the lab; just the KRL test alone is 20 hours per oil, meaning more than 6 full work days just for that one test result for the group. I’m sure the results will be worth the wait 👍🏻
 
Was looking at https://www.redlineoil.com/gear-oil-for-differentials today.
I recalled reading https://spicerparts.com/en-emea/par...extra-fuel-efficient-synthetic-gear-lubricant which is covered under Spicer warranties:
Click to expand...
and wondered if there is any comparable data on it? I couldn't find any.

I put in Valvoline 85W-140 a few years ago to replace the OEM (!!!) 1971 oil/sludge with 65k miles on the Dana 70HD carrying 8500 lbs. I might be under there this summer so thinking of replacing, or maybe with HPL Differential Life.
 
Ray S said:
Was looking at https://www.redlineoil.com/gear-oil-for-differentials today.
I recalled reading https://spicerparts.com/en-emea/par...extra-fuel-efficient-synthetic-gear-lubricant which is covered under Spicer warranties:

and wondered if there is any comparable data on it? I couldn't find any.

I put in Valvoline 85W-140 a few years ago to replace the OEM (!!!) 1971 oil/sludge with 65k miles on the Dana 70HD carrying 8500 lbs. I might be under there this summer so thinking of replacing, or maybe with HPL Differential Life.
Click to expand...
I couldn’t find any data on it either. But, based on the HTHS data (and I know differentials aren’t exactly the same, but I haven’t found HTHS vs MPG claims for gear oils), the claimed 2.5% savings means the HTHS of their XFE is roughly 0.75 to 2.5 numbers lower than a “normal” 75w90.

Now, considering that the average pickup has somewhere between 10-20x gear multiplication in first gear with diff ratio, the contact patch on the gear set is probably experiencing upwards of 150,000 psi in first gear at max torque, and that rough calculation is unladen (not towing). I’m not willing to sacrifice the gear set for what’s certainly less than a theoretical 0.5mpg increase in economy (2.5% x 20mpg).

You can probably get away with this in an econobox where there’s no towing and even fully laden the overall weight of the vehicle doesn’t change much… but by then you’re already in the 75w85 OEM recommendation. Also factor in that those small engines don’t generate the kind of torque that the larger pickup engines do.

IMHO chasing such a small potential gain at the expense of the hardest-working component in your driveline is penny wise and pound foolish.

HPL’s 75w90 picked up nearly 8HP on a chassis dyno compared to a very well known and funded major gear oil when tested in an actual NASCAR application. A reduction in friction without sacrificing HTHS (which is what the HPL did) is the only sensible way to chase mpg in a gear oil as far as I can see. 👍🏻
 
SubieRubyRoo said:
You can probably get away with this in an econobox where there’s no towing and even fully laden the overall weight of the vehicle doesn’t change much… but by then you’re already in the 75w85 OEM recommendation. Also factor in that those small engines don’t generate the kind of torque that the larger pickup engines do.
Click to expand...
The Spicer product actually extends the axle warrantee on big rigs:
Purchase a new heavy-duty or medium-duty Spicer service
carrier for your linehaul vehicle and fill it with Spicer® XFE
75W-90 extra fuel-efficient synthetic gear lubricant. When
doing so, you can extend your 2-year unlimited warranty by
an additional 12 months for a total of 3 years.
Click to expand...
I found the PDF https://www.oil-club.ru/forum/applications/core/interface/file/attachment.php?id=82109 which has a few points
Properties Unit Typical Value Method
SAE class 75W-90 SAE J 306
Density at 15.6 °C lbs/gal 0.864 (7.21) ASTM D 1298
Viscosity index – 169 ASTM D 2270
at 100˚ C mm2/s 15.2 ASTM D 445
at 40˚ C mm2/s 95.4 ASTM D 445
at -40˚ C mPas 45, 100 ASTM D 2983
Flash Point °C 210 ASTM D 92
Pour Point °C -57 ASTM D 97
 
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