Simple over based sulfonate greases have been known from the middle of the past century. These were mainly used as anticorrosion coatings due to their tackiness and capability to inhibit corrosion processes, but other performance properties – such as oxidation stability -were poor.In this respect, simple overbased-alkyl salicylate greases do not differ highly from sulfonate ones.
Complex overbased greases, however, must be regarded in another category. Complex versions compare advantageously with simple overbased greases because they contain calcium metaborate (CMB) and 12-hydroxystearate (CHOS), as well as overbased sulfonate or alkyl salicylate. Complex overbased versions of these greases are on the same performance level, and by some properties exceed such multifunctional products as complex lithium, aluminum and polyurea greases.