Both oil and gas are the primary fluids present in the gas. Both have separate functionalities and they should not be mixed. However, sometimes, the oil smells like gas- which is nothing but an indication of gas-oil mixing. Problem in the fuel injector, problem in the piston rings, no oil change, putting gas instead of oil- are the common causes for oil smell like gas. Understanding the leading cause will help you to fix the problem and prevent the issues down the road.