I have 2001 Excurison. It is drinking oil. I have asked every one I know. Comes down to two answers. Turbo seals or a Injector o-ring. Happened all of a sudden. It will use 2 quarts in 50 miles. No leaking no smoke. Injectors have arond 20,000 miles since new. Question is how can I figure out what injector is leaking if it is? No crap I have put over 16 quarts of oil in it to keep it on the stick. It never used oil. Maybe a quart every 5 months. Thanks for any help.