As a former GM salesman, let me say that I generally trust the OLM. Particularly when paired with a good synthetic or synthetic blend motor oil. My 2009 Chrsler T&C seems to go off at around 3k miles. It does not give a percentage, it just says "Change Oil". Is the just Chrysler covering their butt? I cant bing myself to dump good synthetic oil before 7k or 8k miles. Or a good conventional oil before 5k.