Osama Hamad Abd Alsalam Alasamar Alhadheeri, Ahmed Salem Mohamed Alrwiq, Murad Salem Mohamed Alrawiq, Abdulgader Alsharif. The Positive and Negative Effects of the Oil  Viscosity on Internal Combustion Engine Oils (Gasoline – Diesel) in Libya . jibas. 2026;2(1):57-81. doi:10.65421/jibas.v2i1.49