Originally Posted By: MotoTribologist
Originally Posted By: Virtus_Probi
Do you feel the same way about adding MoS2 (Liqui Moly, for example) to motor oil?
Only in applications that call for it. There are certain manufacturers that say that a slug of moly is good, but this is usually for when they have a multipurpose oil and the moly additive is for when they want that multipurpose oil to go into a transmission or final drive.
I wouldn't want moly solids going around in my engine unless that engine is always running and the oil never has the change to settle. If it is truly the liquid moly additives like a moly carbamate, that would be slightly different.
The difference between MoS2 and things like moly carbamate and ZDDP is that the MoS2 is not a surface active chemical. It is a boundary lubricant so it does not alter the chemistry of the actual oil; it just adds a slug of something else, which can be beneficial in certain applications.
I would still err on the side of, to add an additive without consulting the manufacturer oil the original fluid first is not advisable. I don't suggest anyone top treat into my formulas because I know exactly what extra ZDDP and other surface active chemicals can do to the total performance and I'm not a fan.
OK, thanks for your thoughts.
I looked at the "Chemwatch" sheet for Liqui Moly MoS2 and the only ingredients listed are mineral oil and molbdenum disulfide itself, nothing about any carbamates. I thought that this product was designed to keep the MoS2 in suspension, but maybe that is just advertising or misinformation?