High system and peak effects increase temperatures and lead tooil degradation products known as oxidation, resin and varnish, these by-products lead to the sticky valves which typically occur after periods of non-operation.

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Highsystemandpeakeffectsincreasetemperaturesandleadtooildegradationproductsknownasoxidation,resinandvarnish,theseby-productsleadtothestickyvalveswhichtypicallyoccurafterperiodsofnon-operation.