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Moly lowers Timken OK load #4671215
02/19/18 06:13 PM
02/19/18 06:13 PM
Joined: May 2006
Posts: 2,229
Lakeside CA
another Todd Offline OP
another Todd  Offline OP
Joined: May 2006
Posts: 2,229
Lakeside CA
I am looking at Mystik JT6 Hi Temp grease specs and it has an Timken OK load of 80; but the same grease with 3% moly has a Timken OK load of 60. I thought moly would always increase load capacity, but apparently not always true. Anybody have insight on why moly would lower the load carrying ability of this grease?


2015 Ford F250 Diesel Crew Cab FX4
2017 Ford Escape 2.0
2002 GMC Yukon
2015 Hyundai Accent
2008 Yamaha Rhino 700 FI
Re: Moly lowers Timken OK load [Re: another Todd] #4671303
02/19/18 07:20 PM
02/19/18 07:20 PM
Joined: Jun 2002
Posts: 19,484
Iowegia - USA
MolaKule Offline
MolaKule  Offline
Joined: Jun 2002
Posts: 19,484
Iowegia - USA

What matters is how much EP additive is in each formulation.

Moly is primarily a friction modifier but in larger treatment levels contributes to some (not the only) EP activity.


"Molon Labe" (Greek, King Leonidas to the Persians regarding their weapons "Come and Take Them!").
Re: Moly lowers Timken OK load [Re: another Todd] #4671453
02/19/18 10:47 PM
02/19/18 10:47 PM
Joined: Feb 2014
Posts: 2,434
[email protected] CZ firearm factory
Marco620 Offline
Marco620  Offline
Joined: Feb 2014
Posts: 2,434
[email protected] CZ firearm factory
Sounds legit to me.


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Re: Moly lowers Timken OK load [Re: another Todd] #4671470
02/19/18 11:49 PM
02/19/18 11:49 PM
Joined: Dec 2016
Posts: 7,117
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 7,117
Waco, TX
Moly is for helping things that "slide against each other" to not wear.. (Like cam lobes & rockers)

Roller bearings aren't supposed to do any "sliding". Just rolling.


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: Moly lowers Timken OK load [Re: another Todd] #4671632
02/20/18 08:10 AM
02/20/18 08:10 AM
Joined: Feb 2016
Posts: 686
NJ, USA
MotoTribologist Offline
MotoTribologist  Offline
Joined: Feb 2016
Posts: 686
NJ, USA
The percentage of moly in a grease is not directly correlated to EP performance. A grease with less or no molybdenum and a higher EP test result contains some additional non-moly EP additives to boost performance.

Re: Moly lowers Timken OK load [Re: MotoTribologist] #4673649
02/21/18 06:33 PM
02/21/18 06:33 PM
Joined: Dec 2016
Posts: 7,117
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 7,117
Waco, TX
Originally Posted By: MotoTribologist
The percentage of moly in a grease is not directly correlated to EP performance. A grease with less or no molybdenum and a higher EP test result contains some additional non-moly EP additives to boost performance.


Lithium Complex greases are typically "extreme pressure"


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: Moly lowers Timken OK load [Re: Linctex] #4674166
02/22/18 09:27 AM
02/22/18 09:27 AM
Joined: Feb 2016
Posts: 686
NJ, USA
MotoTribologist Offline
MotoTribologist  Offline
Joined: Feb 2016
Posts: 686
NJ, USA
Originally Posted By: Linctex
Originally Posted By: MotoTribologist
The percentage of moly in a grease is not directly correlated to EP performance. A grease with less or no molybdenum and a higher EP test result contains some additional non-moly EP additives to boost performance.


Lithium Complex greases are typically "extreme pressure"

If they contain EP additives they certainly are. Lithium complex thickener offers little to no inherent EP performance though.

Re: Moly lowers Timken OK load [Re: another Todd] #4679837
02/27/18 05:12 PM
02/27/18 05:12 PM
Joined: Oct 2017
Posts: 2
WA, USA
digireg2 Offline
digireg2  Offline
Joined: Oct 2017
Posts: 2
WA, USA
Not only moly is the part of the formula you would have to exclude a lot of factors.

1. EP testing is relevant for EP conditions they are rare.
2. Moly in greases is antiwear additive.
3. Moly oxidizes readily in a presence of air and moisture turning into abrasive Molybdenum Oxide (III)

Re: Moly lowers Timken OK load [Re: digireg2] #4680357
02/28/18 07:51 AM
02/28/18 07:51 AM
Joined: May 2013
Posts: 122
the Netherlands
miro Offline
miro  Offline
Joined: May 2013
Posts: 122
the Netherlands
Originally Posted By: TriboTEX

3. Moly oxidizes readily in a presence of air and moisture turning into abrasive Molybdenum Oxide (III)

Good mentioned. In era of MOS2 hype people forget there is no single wonderful material for all the problems that we have.

Some basics from WIkipedia - https://en.wikipedia.org/wiki/Molybdenum_dioxide
Molybdenum oxide is a constituent of "technical molybdenum oxide" produced during the industrial processing of MoS2

2 MoS2 + 7O2 → 2MoO3 + 4SO2
MoS2 + 6MoO3 → 7MoO2 + 2SO2
2 MoO2 + O2 → 2MoO3

Last edited by miro; 02/28/18 07:52 AM.
Re: Moly lowers Timken OK load [Re: another Todd] #4704743
03/23/18 09:13 PM
03/23/18 09:13 PM
Joined: Jun 2003
Posts: 17,809
Deplorable in apple valley, ca
Chris142 Offline
Chris142  Offline
Joined: Jun 2003
Posts: 17,809
Deplorable in apple valley, ca
My truck calls for a moly grease in its wheel bearings. I use it in them and the u-joints. Never had a failure.


02 Wrangler carlube 5w30
87 F250 traveler 15w40
07 fjcruiser Chevron 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40
Re: Moly lowers Timken OK load [Re: MolaKule] #4705020
03/24/18 07:52 AM
03/24/18 07:52 AM
Joined: Apr 2015
Posts: 337
Upper midwest
Mainia Offline
Mainia  Offline
Joined: Apr 2015
Posts: 337
Upper midwest
I thought I heard 3% moly is ok for ball bearings, but 5% and above is not?? Going by Caterpillar specs.

Re: Moly lowers Timken OK load [Re: Mainia] #4705237
03/24/18 11:56 AM
03/24/18 11:56 AM
Joined: Aug 2008
Posts: 3,231
Where the wind comes sweepin'
Reddy45 Offline
Reddy45  Offline
Joined: Aug 2008
Posts: 3,231
Where the wind comes sweepin'
Originally Posted By: Mainia
I thought I heard 3% moly is ok for ball bearings, but 5% and above is not?? Going by Caterpillar specs.


I am inclined to think that most people who have used moly grease in a roller application ended up using a 3% moly formula that is very commonly bought at the auto store.


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