ISX, Oil check procedure?

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Dont confuse total system capacity with oil change capacity. A dry ISX, after assembly or rebuild, will take 50-52L. During a service, they will take about 45L inc. filter. The film of oil on everything really adds up, and depending on the angle of the engine there can be 2-3L retained in the shallower end of the oil pan and just below the drain plugs at the deep end.