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#4473368 - 07/28/17 08:34 PM High Moly Oils bad for Rocker Arm Needle Bearings?
davison0976 Offline

Registered: 09/11/14
Posts: 164
Loc: 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?

#4473390 - 07/28/17 08:54 PM Re: High Moly Oils bad for Rocker Arm Needle Bearings? [Re: davison0976]
PeterPolyol Offline

Registered: 03/06/16
Posts: 1003
Loc: 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.

#4473419 - 07/28/17 09:20 PM Re: High Moly Oils bad for Rocker Arm Needle Bearings? [Re: davison0976]
Dyusik Offline

Registered: 09/26/14
Posts: 1732
Loc: 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.

Edited by Dyusik (07/28/17 09:20 PM)
95 Cherokee 190K RT6 5W40,Denso
07 IS250 93K FB ?w??,FULL
04 YZF-R1 18K DELO 15w40,FU
99 HD XL1200S 18K 76 20w50,NAPAG
14 RX450h 28k M1 0w20,Denso

#4473512 - 07/28/17 11:11 PM Re: High Moly Oils bad for Rocker Arm Needle Bearings? [Re: davison0976]
Rand Offline

Registered: 08/20/03
Posts: 12405
Loc: NE,Ohio
High moly grease is usually 5%

Very High moly oil is .2% max.
2017 Jeep Cherokee Trailhawk V6