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Continued interest in energy conservation and carbon dioxide emissions has resulted in enhanced opportunities for development of fuel efficient lubricants. This fuel efficiency has been achieved to a large extent by reducing viscosity as far as volatility and lubrication requirements allow. There has been much industry activity to assess fuel efficient lubricants without compromising engine durability. One area of potential durability concern is that of the overhead camshaft (OHC) rocker follower configuration widely used in modern passenger car engines. A motored cylinder head from an industry standard wear test having an OHC rocker follower configuration has been instrumented to measure oil film thickness (OFT) in an exhaust valve contact by means of an electrical capacitance technique.