i will check with the engine mfctrer, i just wanted to post a forum first to see if anyone has done it, thats what the forum is here for right? second the only reason why i was asking is because i can get jp-8 for free by the gallons, and hey that could possibly be better than going to the local airport and paying right? fresh ;-) thanks all for the EUCATED answers, i am just an UNEDUCATED FLIGHTLINE MECHANIC on fighter jets