This paper briefly reviews the scope of the Oil Labeling Assessment Program and the detailed planning that is Involved in conducting the program. The results of analyses on 136 samples of engine oils that were purchased in the Spring of 1988 are presented and discussed. These samples were all labeled SF, or a combination of SF and a C category. A comparison of 1988 sampling period results with those obtained in 1987 suggests a marked reduction in questionably labeled oils. Additionally, 20 samples of SF oils that were found to be questionably labeled in the 1987 sampling were resampled and these results are discussed.