Additive package in synthetic oil
- Thread starter evo6
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Has been known to happen--although it is usually the result of an additive overdose, and enough remains mixed to provide plenty of protection.
MolaKule
Staff member
**** brings up an excellent point.
The oil can only hold so much additive content. Going further than the saturation point of the solute (base oil) doesn't allow the additional additive package to properly mix.
This is why we make recommendations on third party additive treatment rates, one of those based on calculations about how far we are below the staturation point.
The oil can only hold so much additive content. Going further than the saturation point of the solute (base oil) doesn't allow the additional additive package to properly mix.
This is why we make recommendations on third party additive treatment rates, one of those based on calculations about how far we are below the staturation point.
Mola ,what is the saturation point , as some of the older rated oils had alot higher additive levels .
MolaKule
Staff member
The saturation point is where the solute, in this case the oil, cannot dissolve, disperse, or keep the additives in solution.
Take a beaker of warm water. Add salt or sugar about 1/4 teaspon at a time. Mix. The salt or sugar disappears into solution (water is still clear). Add enough salt or sugar and the next time you mix you will see large particulates (clouding) and even get to the point of crystalization. You have "saturated" the solution to the point whereby adding more salt or sugar does not dissolve into the water.
BTW, this how you can make rock candy. Take food coloring and color warm water. Add sugar until the solution become cloudy. Take string and wrap it around the pencil and drop string into the sugarwater.
Sugar crystals will form on the string as the water evaporates.
Take a beaker of warm water. Add salt or sugar about 1/4 teaspon at a time. Mix. The salt or sugar disappears into solution (water is still clear). Add enough salt or sugar and the next time you mix you will see large particulates (clouding) and even get to the point of crystalization. You have "saturated" the solution to the point whereby adding more salt or sugar does not dissolve into the water.
BTW, this how you can make rock candy. Take food coloring and color warm water. Add sugar until the solution become cloudy. Take string and wrap it around the pencil and drop string into the sugarwater.
Sugar crystals will form on the string as the water evaporates.
Mola , what I meant as a question is how much for example ppm zinc can be used before saturation takes place?
MolaKule
Staff member
About 20,000 ppm is about the max for ZDDP, +, - 5,000 ppm in mineral oil; slightly lower for full synthetics; greater for majority polyol ester bases.
MolaKule
Staff member
Not sure about moly, but would estimate 10,000 ppm, definately less than ZDDP.
Either way, you are not going to see that much ZDDP or Moly in any fluid.
What you also have to consider is that each individual additive contributes to the "load" of the total additive package, and hence, total solubility of the host oil decreases with each additive component.
Either way, you are not going to see that much ZDDP or Moly in any fluid.
What you also have to consider is that each individual additive contributes to the "load" of the total additive package, and hence, total solubility of the host oil decreases with each additive component.
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