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High Moly Oils bad for Rocker Arm Needle Bearings? #4473368
07/28/17 08:34 PM
07/28/17 08:34 PM
Joined: Sep 2014
Posts: 164
NJ, USA
davison0976 Offline OP
davison0976  Offline OP
Joined: Sep 2014
Posts: 164
NJ, USA
I was looking at some UOAs the other day and noticed some oils, like RedLine for example, have higher level of Moly. Should high Moly oils and Moly additives be avoided in engines where rocker arms have needle bearings, like Pentastar V6, for example? IIRC the general consensus is not to use Moly grease in needle bearings. What about the oils?

Re: High Moly Oils bad for Rocker Arm Needle Bearings? [Re: davison0976] #4473390
07/28/17 08:54 PM
07/28/17 08:54 PM
Joined: Mar 2016
Posts: 1,351
toronto
PeterPolyol Offline
PeterPolyol  Offline
Joined: Mar 2016
Posts: 1,351
toronto
The only thing to worry about is 'bearing skate'. It's when the bearing experiences such little friction that the needle/roller doesn't even turn, but instead slides or 'skates' in a fixed position. This can cause a flat spot if the needle does this for an extended period of time.

I personally don't think there is a practical concern for the roller in the follower to fail because of this with moly engine oil formulations.

Re: High Moly Oils bad for Rocker Arm Needle Bearings? [Re: davison0976] #4473419
07/28/17 09:20 PM
07/28/17 09:20 PM
Joined: Sep 2014
Posts: 2,093
US-WA
Dyusik Offline
Dyusik  Offline
Joined: Sep 2014
Posts: 2,093
US-WA
If only was in the same amounts as in grease, but this is less than a tenth of a percent for most, and even in red line doses there are dispersants in the oil helping things move along, when flow of oil should be enough on its own.
Although it is fun to speculate, I get trapped in thoughts like this often.

Last edited by Dyusik; 07/28/17 09:20 PM.

95 Cherokee 190K DELO 10W30,XG8
07 IS250 100K Napa 10w30,FULL
04 YZF-R1 19K DELO 15w40,XG7317
99 HD XL1200S 20K VR1 20w50,1515
14 RX450h 32k PP MIX,NAPAG
Re: High Moly Oils bad for Rocker Arm Needle Bearings? [Re: davison0976] #4473512
07/28/17 11:11 PM
07/28/17 11:11 PM
Joined: Aug 2003
Posts: 12,896
NE,Ohio
Rand Online content
Rand  Online Content
Joined: Aug 2003
Posts: 12,896
NE,Ohio
High moly grease is usually 5%

Very High moly oil is .2% max.


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