What would cause one to choose either one of these Schaeffer products over the other? It appears to me that the primary difference is that the 267 uses moly disulfide and the 293 uses soluble moly. However, I don't think I care which is used in my differentials. So, what would make a person choose one over the other?
Schaeffer #267 vs. #293
- Thread starter bulwnkl
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MolaKule
Staff member
293 is for gearboxes with filtration systems. Both are synthetic blends of GI/GII/GIV.
MolaKule
Staff member
#267 is a very HD oil with the solid MoS2.
I dont' see any GL-5 specs on any of the 239 oils which is what you want. Try the #741 if you want a high VI, wide temp diffy gear oil.
I dont' see any GL-5 specs on any of the 239 oils which is what you want. Try the #741 if you want a high VI, wide temp diffy gear oil.
Thank you, Molakule. Given the difference in Timken OK load and FZG test (not that I claim to know too much about them) between the 741 and the 267/293 lines, combined with responses in the other topic about cold weather service, I think I'll stick with the 267 or 293.
Here's hoping you're able to get your situation under control and re-open your business doors.
Here's hoping you're able to get your situation under control and re-open your business doors.
MolaKule
Staff member
The 293's are speced for narrow SAE/ISO viscosity ranges.
I would recommend a wider viscosity lube.
The 293A has a star beside to denote for use in filtered lube systems. I don't see a 75W90 version of 293 listed on their website.
http://www.schaefferoil.com/gear_oils.html
I would recommend a wider viscosity lube.
The 293A has a star beside to denote for use in filtered lube systems. I don't see a 75W90 version of 293 listed on their website.
http://www.schaefferoil.com/gear_oils.html
Molakule, is it true that the Timken OK load test is not generally accepted by the industry as a suitable gear oil test? Is it true that going from a "GL-4" treat rate (~2% isn't that?) of EP adds to a GL-5 level (what's that, 8%?) will drop the Timken OK load rating from ~100 to ~60? Do base stocks affect that? Does a borate EP system (as opposed to a S-P system) affect that?
MolaKule
Staff member
The Timken load test is still used to test relative loads. Going from a lower to higher treat rate in general results in better Timken loads. The type and starting viscosity of base stocks will affect the Timken load ratings.
K-Borate and S-P are both good EP additves and must be used with the proper base oils.
K-Borate and S-P are both good EP additves and must be used with the proper base oils.
Does the Molybdenum 2-Ethylhexyl Phosphoroditolate used in #293 aggregate in the same manner as MoS2?
MolaKule
Staff member
"Does the Molybdenum 2-Ethylhexyl Phosphoroditolate used in #293 aggregate in the same manner as MoS2?"
Neither compound "aggregates." MoPDT is a soluble moly with phosphorus and sulfur elements similar to ZDDP, except moly is substituted for zinc in the molecule.
MoS2 is a submicron solid dispersed in a carrier oil.
Both are excellent EP additives.
For more info about gear lubes see:
http://theoildrop.server101.com/forums/s...ge=0#Post721545
and
http://theoildrop.server101.com/forums/s...ge=0#Post721579
in the section, "Science and Technology of Oils and Lubricant Additives."
Neither compound "aggregates." MoPDT is a soluble moly with phosphorus and sulfur elements similar to ZDDP, except moly is substituted for zinc in the molecule.
MoS2 is a submicron solid dispersed in a carrier oil.
Both are excellent EP additives.
For more info about gear lubes see:
http://theoildrop.server101.com/forums/s...ge=0#Post721545
and
http://theoildrop.server101.com/forums/s...ge=0#Post721579
in the section, "Science and Technology of Oils and Lubricant Additives."
Molakule,
Thanks, I read through both of those articles briefly. I was under the impression that MoS2 builds upon itself whereas types do not such as MoDTC.
Perhaps my use of aggregate was incorrect, in which case it was performed with a poetic license.
Ethan
Thanks, I read through both of those articles briefly. I was under the impression that MoS2 builds upon itself whereas types do not such as MoDTC.
Perhaps my use of aggregate was incorrect, in which case it was performed with a poetic license.
Ethan
MolaKule
Staff member
Look at the white paper on Friction Modifiers and AW Additives.
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