"Agreed--I think the wheel well-mounted air-oil cooler was a monumental act of wishful thinking...." Really? Guess I will have to do a study on air flow at the oil cooler. Mine seems to work well. What I DO know: air flow at the rear a/c grill is almost zero at highway speeds. Don't put a cooler there without a fan. Search and research, there are no universal answers. You can quote me. David in Durango "Agreed--I think the wheel well-mounted air-oil cooler was a monumental act of wishful thinking...." Really? Guess I will have to do a study on air flow at the oil cooler. Mine seems to work well. What I DO know: air flow at the rear a/c grill is almost zero at highway speeds. Don't put a cooler there without a fan. Search and research, there are no universal answers. You can quote me. David in Durango