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The results of analyses on 300 samples of engine oil purchased in the retail market and analyzed in 1991 are discussed. All samples were labeled with the API SF or SG Service category, either alone, or in combination with, an API C category designation. Also, 9 oils previously found to be questionably labeled, from the 1990 set, were repurchased and analyzed. These results are included.

The results of analyses on 300 samples of engine oil purchased in the retail market in 1990 are discussed. All samples were labeled with the API SF or SG Service Category, separately, or in combination with an API C category designation. Also, 17 oils previously found to be questionably labeled, from the 1989 set, were repurchased and analyzed. These results are included.