Petroleum Quality Institute of America

The Petroleum Quality Institute of America (PQIA) is an independent resource for information and insights on the quality and performance of lubricants in the marketplace.  Our mission is to serve the consumer of lubricants by reporting on the quality and integrity of lubricants in the marketplace.  




In addition to the use of calcium sulfonates, magnesium sulfonates are used in engine oils as detergent additives. Although magnesium sulfonate is more expensive than calcium sulfonate, some formulators reportedly prefer its use due to what they feel is improved rust production seen with magnesium sulfonates as compared to calcium sulfonate in diesel engines. Because of this, whereas magnesium can be seen in the spectrographic analysis of diesel engine oils, today it is fairly uncommon to see it at any meaningful level in passenger car engine oil.

For details on ASTM D5185 test method click here.


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