We often have requests to provide coolers such as “My oil is at 80 °C, I need it to be 60 °C, please quote me a cooler doing 80 °C down to 60 °C from 100 L/min”. This almost always results in a cooler larger than required. Your system doesn’t go from 60 °C up to 80 °C in one pass so the cooling doesn’t have to remove it in one pass either.
We often have requests to provide coolers such as “My oil is at 80 °C, I need it to be 60 °C, please quote me a cooler doing 80 °C down to 60 °C from 100 L/min”. This almost always results in a cooler larger than required. Your system doesn’t go from 60 °C up to 80 °C in one pass so the cooling doesn’t have to remove it in one pass either.