This paper proposes the incorporation of oil losses into the OER equation to complement the existing method of assessing estate and mill performances. Once the fresh fruit bunches (FFB) are weighed in, the mill must be held responsible for all oil losses within the perimeters of the mill. The estate, on the other hand, takes ownership of total oil, which is OER plus oil losses. For the system to work, all areas of oil losses must be quantified and subject to regular independent checks. The focus is on oil as the same can be drawn up for kernels.