Kimulu, Ancent MakauMutuku, Winfred NdukuMutua, Nicholas Muthama2018-07-092018-07-092018International Journal of Advances in Scientific Research and Engineering (ijasre) Volume 4, Issue 6 June - 20182454-8006http://ir-library.ku.ac.ke/handle/123456789/18500Research ArticleMost internal combustion engines are fluid cooled using liquid coolants mostly water and ethylene glycol, whose heat transfer capabilities are limited. An alternative for improving their thermophysical properties is the addition of metal oxides so as to make Nanofluids. This study investigates car antifreeze and coolants by comparing water-based and ethylene glycol based Nanofluids to determine the Nanofluid which provides optimum cooling. The governing equations are non–dimensionalised using similarity transformation and the resulting equations solved numerically using the Runge–Kutta fourth order scheme. Graphical results of pertinent parameters on fluid velocity, temperature, skin friction and rate of heat transfer are presented and discussed in depth putting into consideration the industrial application. It was observed that the magnetic field slows the fluid flow while increasing the fluid temperature. Also ethylene glycol Nanofluid offers better cooling capabilities.enNano-fluidAntifreezeRunge-KuttaCoolantArticle