I have a 7.3 powerstroke that I changed the oil cooler on. I some coolant in the oil pan in the process. I have a fumoto valve and drained the pan and out came red ELC. I then put a 1/2 quart of fresh rotella in and opened the drain. All that came out was oil. Could I still have a small amount of coolant at the bottom of the pan and will that small amount cause a problem? Will it burn off? Do I need to send my fresh oil off for a sample?