I've got an '04 250. While pulling about 9k worth of 5th wheel I get some sputtering and huges clouds of black smoke. Had the truck in the shop a few weeks ago for a bed plate leak, just happened to think about the oil servicing thing and decided to change the oil it was definately overserviced, like 16+ qts. I haven't gotten a fuel sample sent off yet but it did not smell like fuel. Could too much oil cause my problem and would it only happen under load? No CEL engine light, I'll run in to town this evening and see if I have any codes. Thanks in advance.