Originally Posted by
jimjim1
However, it would appear that the oils are fuel cooled. If the IDG got first bite at the cooling fuel flow, before the engine oil or maybe simultaneously, then this would appear to explain the statements from the books.
You are correct. DSC 70-41 Fuel System shows an oil cooing diagram with IDG cooling taking place before that warmed fuel goes to the engine oil cooler heat exchanger. See
Oil cooling