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Keven,
What was your rear CHT when the oil was indicating so cold? If it was cold also, my non-expert opinion based on what I have tried to learn from others is that your engine actually WAS too cold. You *can* get your engine too cold (and increase wear) by running with the cowl flap open, unless the ambient it pretty warm (like 80F on the ground or so).
The cowl flaps are there to provide cooling in climb. When you start cruising, you run a LOT more air through the cowl, and you can overcool the engine.
I think.
Kevin
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