An internal combustion engine including a powertrain component, e.g. a valve lifter which has a coating system including a film and an interlayer formed on a wear surface of the component, where: a) the film imparts low friction and wear resistance to the component and comprises at least one of a first gp. of opt. silicon-doped, boron-doped, nitrogen-doped or boron-nitride-doped amorphous hydrogenated carbons. or metal doped amorphous hydrogenated carbon; b) the interlayer is formed between the film and the component and comprises at least one of silicon, siliconc arbide, silicon nitride and boron nitride, and which accommodates stresses engendered by formation of the film, provides mechanical support to the film, and chemical compatibility between the film and the substrate. The component comprises at least one of a ceramic and a metal including one or more of aluminium, aluminium-silicon alloy, magnesium, magnesium alloy, aluminium nitride, titanium, titanium-aluminium alloy and aluminium alloy.
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