Conversion by top-off allows the original oil to be gradually phased out and replaced by the new oil. The graph in the full technical topic illustrates phase-out rate based on several factors: the engine oil consumption, hours the engine operated during the top-off period and system capacity (quarts).
When an engine oil brand change is made, ExxonMobil aviation recommends simply topping off the system with the new oil brand. Always consult with the engine OEM for specific instructions when changing oil types.
To learn more, please download the full technical topic below.
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