Does anyone know if there is anything that can be done to slow done the process of sludge building up in the 4.7. I have read about so many people losing oil pressure and having to replace the engine. i recently took my 200 Durango to the dealer and they advised that there is a slight build up and I should start looking for a new engine. they said it may last 10000 or 40000 more miles(alot of help there). Syntec oils are out of the question.