Oil-soluble colloidal additives

The synthesis and study of oil-soluble metal carbonate colloids is a contin uing area of interest within the field of lubricant additives. The acid neu tralisation properties of these species have been studied for several years . More recently, the introduction of exhaust gas circulation (EGR) systems to combustion engines has increased demands upon the acid neutralisation pe rformance of these additives. This has prompted a resurgence of interest in the reactivity of metal carbonate colloidal additives. (C) 2000 Elsevier S cience Ltd. All rights reserved.