question about cooling your engine oil

Toyota must have an issue they’re trying to correct if they’re cooling engine oil like that.

Our engine oil is cooled by airflow from around the engine block, the and oil pan and by the water in the jackets. Moper is spot on, an aluminum pan will act as a heatsink and wick away heat much faster than stamped steel. Plus an aluminum pan will likely have more capacity. Synthetic oils really help by limiting oil breakdown for when it does get too hot.

IMO, most oil breakdown from overtemp comes from oil that is trapped in areas that doesnt drain back. Especially from the heads. When the engine is shutdown, the block and head temps go up because they are not in motion and the water pump isn’t operating. This bilge oil is exposed to excessive temps while the rest is in the pan, away from heat and cooling off nicely.