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#4671215 - 02/19/18 06:13 PM Moly lowers Timken OK load
another Todd Offline


Registered: 05/15/06
Posts: 2205
Loc: 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?
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#4671303 - 02/19/18 07:20 PM Re: Moly lowers Timken OK load [Re: another Todd]
MolaKule Offline


Registered: 06/05/02
Posts: 19042
Loc: 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.

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#4671453 - 02/19/18 10:47 PM Re: Moly lowers Timken OK load [Re: another Todd]
Marco620 Offline


Registered: 02/25/14
Posts: 2195
Loc: Deplorable Kansan,HK fan!
Sounds legit to me.
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#4671470 - 02/19/18 11:49 PM Re: Moly lowers Timken OK load [Re: another Todd]
Linctex Offline


Registered: 12/31/16
Posts: 6178
Loc: 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.
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#4671632 - 02/20/18 08:10 AM Re: Moly lowers Timken OK load [Re: another Todd]
MotoTribologist Offline


Registered: 02/03/16
Posts: 562
Loc: 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.

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#4673649 - 02/21/18 06:33 PM Re: Moly lowers Timken OK load [Re: MotoTribologist]
Linctex Offline


Registered: 12/31/16
Posts: 6178
Loc: 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"
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"The evidence demands a verdict".
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#4674166 - 02/22/18 09:27 AM Re: Moly lowers Timken OK load [Re: Linctex]
MotoTribologist Offline


Registered: 02/03/16
Posts: 562
Loc: 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.

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#4679837 - 02/27/18 05:12 PM Re: Moly lowers Timken OK load [Re: another Todd]
TriboTEX Offline


Registered: 10/27/17
Posts: 2
Loc: 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)

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#4680357 - 02/28/18 07:51 AM Re: Moly lowers Timken OK load [Re: TriboTEX]
miro Offline


Registered: 05/05/13
Posts: 119
Loc: 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


Edited by miro (02/28/18 07:52 AM)

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#4704743 - 03/23/18 10:13 PM Re: Moly lowers Timken OK load [Re: another Todd]
Chris142 Offline


Registered: 06/05/03
Posts: 16844
Loc: 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.
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#4705020 - 03/24/18 08:52 AM Re: Moly lowers Timken OK load [Re: MolaKule]
Mainia Offline


Registered: 04/06/15
Posts: 205
Loc: Upper midwest
I thought I heard 3% moly is ok for ball bearings, but 5% and above is not?? Going by Caterpillar specs.

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#4705237 - 03/24/18 12:56 PM Re: Moly lowers Timken OK load [Re: Mainia]
Reddy45 Offline


Registered: 08/15/08
Posts: 2973
Loc: USA
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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