the present disclosure relates to new and optimized processes for the preparation of micro - and nano - scale capsules containing lubricant chemical additives . the present disclosure also relates to micro - and nano - scale capsules prepared by such processes , which are useful in a variety of applications , including automotive lubricants , diesel lubricants , industrial lubricants , metal - working lubricants , coolants , and process fluids . micro - and nano - scale capsules prepared as described herein have the required properties that such capsules need to exhibit in order to function effectively and meet the requirements imposed by engine lubrication conditions . the microcapsules may be dispersed in a lubricating oil such that the lubricant exhibits improved stability and anti - wear performance , thereby improving engine fuel efficiency and performance .