My work van is a 2004 Express. 5.3 engine. I have it pretty well loaded down. I drive about 50/50 city highway driving. I use the tow/haul mode quite often. On the highway I run about 70 to 80 mph. I let it idle for a good 10 minutes on cold mornings. I defently do not baby this engine in anyway. My OLM has not come on after 9k miles. What in gods name do you have to do to get this thing to come on at 5k miles. I have not gone 9k miles since I last changed the oil. I just didnt reset it to see how far it will go.