I did the first oil change today at 517 miles. Its a 2003 Ford E-250. I found yellow solids in the bottom of one oil pan, and I verified that it wasn't there before I dropped the oil. It came out of the oil cooler adapter and not the oil pan. Anyone know what this stuff is? I found stuff that resembled it in the oil filler tube on top - in the engine compartment. I never added anything to the engine since I took delivery of it with 7 miles on the odometer.