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Oil Oil Additives Canadian Tire Canadian Tire has a wide selection of Oil Oil Additives including Engine Oils, Diesel Engine Oils, Transmission Fluid and more. M: Engine Oil - Additives: Automotive Results 1 - 24 of 765. Nearly all commercial motor oils contain additives, whether the oils are synthetic or petroleum based. Oil additive - Wikipedia, the free encyclopedia Additives comprise up to 5 by weight of some oils.