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Preheating is preferred for cold weather over oil dilution so many planes have had the system removed. At the oil pump there's an inlet for the fuel, tracing backwards there's a solenoid valve which is energized and allows fuel to flow to the oil system. The solenoid gets its fuel at the strainer for early Skymasters. There's not much more detail in the Cessna maintenance manual and I don't have my engine MM with me at the moment.
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