1. A method for screening lubricating oil additive composition samples, under program control, comprising (a) providing a plurality of different lubricating oil additive composition samples comprising at least one lubricating oil additive, each sample being in a respective one of a plurality of test receptacles; (b) maintaining each sample at a predetermined temperature for a predetermined time; (c) measuring the storage stability of each sample to provide storage stability data for each sample; and, (d) outputting the results of step (c).