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#1060919 - 01/09/08 01:53 PM MoDTC effect on wear rates
JAG Offline


Registered: 10/23/05
Posts: 4893
Loc: Fredericksburg, VA
http://www.sae.org/technical/papers/2004-01-2005

"Abstract:
The effects of lubricating oil on friction and wear were investigated using light-duty 2.2L compression ignition direct injection (CIDI) engine components for bench testing. A matrix of test oils varying in viscosity, friction modifier level and chemistry, and base stock chemistry (mineral and synthetic) was investigated.

Among all engine oils used for bench tests, the engine oil containing MoDTC friction modifier showed the lowest friction compared with the engine oils with organic friction modifier or the other engine oils without any friction modifier. Mineral-based engine oils of the same viscosity grade and oil formulation had slightly lower friction than synthetic-based engine oils.

In the comparison of wear on cylinder bores lubricated with the same viscosity of lubricant, the lubricant containing the MoDTC friction modifier had the lowest wear depth, probably because of a wear-resistant reaction film formed by the reaction of sulfur from ZnDTP (Zinc Dialkyl Dithiophosphate) and MoDTC. The wear depth of the engine oil without any friction modifier was the highest among all lubricants tested. With MoDTC in the engine oil, the wear depths for all tested piston rings were lower than those operating in the absence of MoDTC. This might be caused by a synergistic wear-resistant film formation (both MoS\d2 and polyphosphates formed) on both cast iron bores and piston rings as evidenced by EDX and XPS surface analyses. Surface analyses were conducted to help understand the surface mechanisms responsible for friction reduction and the impact of engine materials and additives on wear."

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#1060929 - 01/09/08 02:11 PM Re: MoDTC effect on wear rates [Re: JAG]
buster Offline


Registered: 11/16/02
Posts: 30525
Loc: NJ
Interestng. Thanks JAG. I know some formulators still feel MoTDC + ZDP are still the best AW additives available.
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#1060940 - 01/09/08 02:28 PM Re: MoDTC effect on wear rates [Re: buster]
JAG Offline


Registered: 10/23/05
Posts: 4893
Loc: Fredericksburg, VA
Yeah those two additives together can make some really good anti-wear films according to numerous studies/tests that analyzed them along with other additive combinations.

The combination provides both low friction and low wear which don't always come together with some other anti-wear films resulting from different anti-wear additive combinations.

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#4719846 - 04/07/18 07:18 PM Re: MoDTC effect on wear rates [Re: JAG]
Linctex Offline


Registered: 12/31/16
Posts: 6186
Loc: Waco, TX
Originally Posted By: JAG
http://www.sae.org/technical/papers/2004-01-2005

"Abstract:

Mineral-based engine oils of the same viscosity grade and oil formulation had slightly lower friction than synthetic-based engine oils."


Am I the only one to find this little tidbit to be rather amazing?
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#4719879 - 04/07/18 07:45 PM Re: MoDTC effect on wear rates [Re: JAG]
bulwnkl Offline


Registered: 02/09/05
Posts: 1754
Loc: Arizona
Wow! Howíd you dig up this decade-old thread?

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#4719882 - 04/07/18 07:48 PM Re: MoDTC effect on wear rates [Re: Linctex]
Shannow Offline


Registered: 12/12/02
Posts: 40205
Loc: 'Stralia
Originally Posted By: Linctex
Originally Posted By: JAG
http://www.sae.org/technical/papers/2004-01-2005

"Abstract:

Mineral-based engine oils of the same viscosity grade and oil formulation had slightly lower friction than synthetic-based engine oils."


Am I the only one to find this little tidbit to be rather amazing?


No, there's more "stuff" including polar molecules and sulfur bearing molecules...has a "little" anti wear effect in and of itself

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#4719906 - 04/07/18 08:06 PM Re: MoDTC effect on wear rates [Re: Linctex]
JAG Offline


Registered: 10/23/05
Posts: 4893
Loc: Fredericksburg, VA
Originally Posted By: Linctex
Originally Posted By: JAG
http://www.sae.org/technical/papers/2004-01-2005

"Abstract:

Mineral-based engine oils of the same viscosity grade and oil formulation had slightly lower friction than synthetic-based engine oils."

Am I the only one to find this little tidbit to be rather amazing?

Blast from the past! It is interesting. We donít have enough details about the oils used, oil temperature, or where on the Stribeck curve they were operating in to give a definitive explanation of that. The HTHS viscosities, the type of synthetic oil (Group III or PAO or ester or some combination?) would be helpful. If an oiled component is operating on the left of the minimum friction location on the Stribeck curve, increasing the viscosity will decrease friction. Valvetrain typically is in that situation. If to the right of minimum, increasing viscosity increases friction. Maybe the HTHS viscosity of the synthetic differed from the mineral oils. Maybe the oil temperature was somewhat low, making the mineral oil viscosity higher than the synthetic. If left-of-minimum in Stribeck curve, that would cause lower friction.

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#4719920 - 04/07/18 08:16 PM Re: MoDTC effect on wear rates [Re: JAG]
Shannow Offline


Registered: 12/12/02
Posts: 40205
Loc: 'Stralia
But given that it's exploring the effect of friction modifiers (MoDTC), they are IN the zone where they work, not to the right on the curve.


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#4719926 - 04/07/18 08:21 PM Re: MoDTC effect on wear rates [Re: JAG]
JAG Offline


Registered: 10/23/05
Posts: 4893
Loc: Fredericksburg, VA
Very good point, Shannow. I didnít think of that. So then, higher viscosity, lower friction. There is also the matter of the pressure-viscosity coefficients being different for different base oils. Not sure if the pressures in the test were high enough to make that significant. I doubt it was in a test simulating a piston in a cylinder liner.

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#4719951 - 04/07/18 08:42 PM Re: MoDTC effect on wear rates [Re: JAG]
Shannow Offline


Registered: 12/12/02
Posts: 40205
Loc: 'Stralia
Not sure about rings, and the sliding type of motion WRT pressure/viscosity change.

Personally I don't THINK it would be much impact...I KNOW it's not a factor in bearings, the surfaces aren't strong enough...cams it's there for a bit, not sure on rings.

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#4719976 - 04/07/18 09:11 PM Re: MoDTC effect on wear rates [Re: JAG]
Garak Offline


Registered: 12/05/09
Posts: 24764
Loc: Regina, Saskatchewan, Canada
Of course, watch how far to the right you go, where hydrodynamic friction rises.
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2008 Infiniti G37 - Shell ROTELLA T6 Multi-Vehicle 5w-30, NAPA Gold 7356
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#4720091 - 04/07/18 11:54 PM Re: MoDTC effect on wear rates [Re: JAG]
SR5 Offline


Registered: 07/07/15
Posts: 4529
Loc: Down Under
This recent thread on Schaeffer oil, contains a tech document from Schaeffer that says organo-moly and ZDDP work well together to enhance eachothers ability in anti-wear, anti-friction and anti-oxidant ability.

https://www.bobistheoilguy.com/forums/ubbthreads.php/topics/4717918/

Most of this is in the final two pages.

It sounds like ZDDP and MoDTC work well together.
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#4720311 - 04/08/18 08:48 AM Re: MoDTC effect on wear rates [Re: SR5]
zeng Offline


Registered: 09/01/15
Posts: 2200
Loc: Malaysia
Originally Posted By: SR5
It sounds like ZDDP and MoDTC work well together.

I believe ZDDP is temperature-dependent and it's temperature-activated,
however MoDTC in non-temperature-dependent and it's pressure-activated or contact-activated.

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#4720439 - 04/08/18 10:59 AM Re: MoDTC effect on wear rates [Re: JAG]
alarmguy Offline


Registered: 07/10/12
Posts: 2177
Loc: South Carolina
Good thread and its over my head or my lack of interest but caught my attention for one reason.
Never mind the math, theories, should haves, could haves ...

To the layman, I always ask the same question and make the same statement.
I pretty much use the API conventional oils for my vechicles, always change at or most cases before the required OCI. More or less I stick to what would be the "Severe Use" OCI.
I do in my heart know synthetic is more stable and I do know, for someone who neglects OCIs they most likely would be better off with a synthetic, maybe.

But all these UOAs, since I change my oil ontime and before, have never shown me less wear in an apples to applies comparison of synthetic and conventional oil, in my heart, its marketing for greater profit.
Meaning they will formulate the oil however way they can to meet and exceed the API rating of the oil and I suspect even most conventional have a form of a syn blend now but will not be advertised as the company rather sell a more profitable oil labeled as such...

Have no idea why I am posting this *L* ... just seemed like the right thread. :o)
Knock on wood, but in decades of owning cars, trucks, boats and motorcycles, I never had an engine failure nor have I ever sold one off that was burning oil or engine defect in any way.


Edited by alarmguy (04/08/18 11:01 AM)
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#4720449 - 04/08/18 11:07 AM Re: MoDTC effect on wear rates [Re: alarmguy]
PimTac Online   content


Registered: 03/04/17
Posts: 4651
Loc: Soviet State of Washington
Originally Posted By: alarmguy
Good thread and its over my head or my lack of interest but caught my attention for one reason.
Never mind the math, theories, should haves, could haves ...

To the layman, I always ask the same question and make the same statement.
I pretty much use the API conventional oils for my vechicles, always change at or most cases before the required OCI. More or less I stick to what would be the "Severe Use" OCI.
I do in my heart know synthetic is more stable and I do know, for someone who neglects OCIs they most likely would be better off with a synthetic, maybe.

But all these UOAs, since I change my oil ontime and before, have never shown me less wear in an apples to applies comparison of synthetic and conventional oil, in my heart, its marketing for greater profit.
Meaning they will formulate the oil however way they can to meet and exceed the API rating of the oil and I suspect even most conventional have a form of a syn blend now but will not be advertised as the company rather sell a more profitable oil labeled as such...

Have no idea why I am posting this *L* ... just seemed like the right thread. :o)
Knock on wood, but in decades of owning cars, trucks, boats and motorcycles, I never had an engine failure nor have I ever sold one off that was burning oil or engine defect in any way.



Your comment is correct alarmguy, and it probably mimics the thinking of most owners. I also run what the manufacturer runs, use a good brand of oil and drive my vehicles in a sensible manner. I donít like the idea of spending big money on something then abusing it by showing off. In that respect I also buy vehicles that meet not only my needs but also consider the type of driving and climate they will endure.
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