so i changed my oil like 650 miles ago and since then i have burned 1/2 a quart. when i gas it, i get some black and blue smoke out the exhaust. also, under my hood there is a streak of what i think to be is oil and i might have a leak. i dont have the time to check it right now so if ther is something under there i will just close this question. but if anyone can help at all, please let me know. thanks in advance!