This study assessed the growth responses of Solanum lycopersicum grown on spent engine-oil-polluted soil and the effect of Glomus mosseae in degrading spent engine-oil-polluted soil were examined with a view to providing information on the efficacy of the use of G. mosseae in bioremediation. Tomato seedlings raised in nursery were transplanted into 18 pots each was contaminated at 3 levels (1, 3 and 5%), another 18pots each contaminated with spent engine oil + G. mosseae, and 12 pots (control) on 3kg sterilized and unsterilized soil with six replications. Data on growth parameters (plant height, leaf area and number of leaves) were recorded two weeks after transplanting and weekly for the duration of twelve weeks. Data were analysed with descriptive and inferential statistics. The results on contaminated soil without G. mosseae inoculation wilted at 6weeks after transplanting, while tomato plants on contaminated + G. mosseae had significantly higher growth parameters. Plant at 2 weeks after transplanting + G. mosseae had the highest numbers of leaves (27.33) but there was no significant difference (P>0.05) between those grown in sterilized and unsterilized soil. The least number of leaves (23.00) was recorded on the plant treated with 5% spent engine oil in unsterilized soil. Highest leaf area with mean value of 38.28 m2. The while the control with sterilized soil had an average leaf area 22.83 m2, unsterilized soil +G. mosseae (Gm) had the highest plant height with mean value of 26.33cm. The polluted soil + G. mosseae improved this in low level of spent engine oil but good result were not recorded in the pot with higher concentration of spent engine oil (5%) for between 6-8 weeks after transplanting plant had wilted. The study concluded that G. mosseae could be used to upgrade low concentration spent engine oil polluted soil.