The lubrication of surfaces by oils is a key aspect of many academic and industrial problems with significant financial implications. 2-D graphene materials can provide important friction and wear properties which are not offered by the current class of lubrication additives.This area of lubrication additive science is growing in importance because of: Advances in engine technology combined with lower emission requirements; the demand for fuel efficiency and improved friction reduction; and the desire for a longer oil change interval. Hence understanding the role and the adsorption isotherms for lubricant additives at the oil-metal interface is essential. The structure of the alkylated Graphene (GNS-C8 and GNS-C18) adsorbed at the iron oxide/oil interface will be investigated for the first time using polarized neutron reflectometry.The alkylated Graphene composition profiles at the i