I. H. Sheikh, N. Naz, R. Haider, F. Hussain, M. F. Alam, M. Arshad, and M. Nadeem. 2024. “Impact of Engine Oil Change on Vehicular Exhaust Emissions”. Pakistan Journal of Science 76 (03):408-13. https://doi.org/10.57041/vol76iss03pp408-413.