Lucas Response To Zinc Additive

airwoofer said

Going with a solid roller now and thought I better put in a bottle of break in additive as I will be using Rotella 15W-40 next. The additive came from Hughes and it says moly, not "zink". One bottle for 6 qts of oil. Sigh, I have a 8 qt pan.

Seems to me that the little stroker is hard on oil as it comes out pretty dark. Of course, the Brad Penn is dark green when it goes in too.

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airwoofer, I am a chemist and have been employed in the aerospace industry for 25 years. The "moly" additive is used in the airplane industry for high temperature wear protection. When it is combined with sulfur as Molybdenum disulfide (MoS2), it will darken the lubricant depending on the amount blended in. We have greases that are black due to the presence of MoS2. I am not surprised that your Moly containing oil is pretty dark. It is probably due to the Moly being in the form of Molybdenum disulfide (MoS2).

If you really want to know how your oil is performing then you might want to pay to have it analyzed at a petroleum lab. One of my engineer co-workers runs his cars on the road racing circuit and he has his oil analyzed.

Just some info for you.