I have 2005 titan cc with 254,000 miles on it. It's been a great truck, but here recently it has started to burn a lot of oil like a quart every 150-250 miles or so. I haven't found any leaks, I just switched to full synthetic my last oil change which I do myself and add Lucas every oil change. I changed valve covers and pcv valves also. I just ordered my exhaust and tuner from Cajun and I don't want to have it installed if it's something bad and will need a new motor. Any help would be greatly appreciated.