Post#103 » Wed Dec 10, 2014 11:46 pm
There's an oil-to-water cooler in the radiator (actually two: one for the engine and the other for the trans), and have seen diagrams of the oil-to-air cooler in the (left?) fender well on later turbodiesel Gs, such as Alan's G300DT. I have not found this cooler in the FSM for a '93 350GD but am very new to searching through it and may have missed something - perhaps it was in later years? I have a fresh engine air intake setup for a 350GD that was installed in the left fender well, suggesting that there was no oil-to-air cooler there.
The idea is to have oil-to-air first, then oil-to-water. This way you have the benefit of dumping the most heat to air, then either dumping more heat to water or benefiting from the coolant warming up the oil in cold situations.
By the way, I'm passing this information along from Alan and Mark who gave me the education during the last Treffen (thank you gentlemen!). I'm trying to figure out how to stuff all of those coolers into a W460 SWB!