A vehicle engine system comprising an internal combustion engine, a fuel system for fuelling the engine, and a lubrication system for delivering lubrication oil to the engine, the fuel system comprising a fuel reservoir, the lubrication system comprising an oil reservoir and an oil pump for delivery of oil from the oil reservoir to the engine, wherein the oil reservoir is accommodated internally within the fuel reservoir, wherein the oil reservoir is accommodated within the fuel reservoir, and wherein the fuel reservoir comprises a main tank and a supplementary tank which can receive fuel from the main tank and from which fuel can be delivered to the engine.