Does anyone on this site change their oil using the oil life monitoring system? I've had my car for around 16 months and it has about 9500 miles on it. I changed the oil in May 2016 with around 5000 miles just out of concern. Thinking it over, I've relaxed some based on the dealership using synthetic oil at the change. I've seen ads claiming the synthetic oils will last a lot longer than 5000 miles. It's hard to change 50+ years of experience!