I currently have over 128,000 miles on my car. In the past I have always had the oil changed every 3,750 miles, which was considered "severe maintenance" according to the owner's manual. After doing some research on the internet, I was wondering what people thought about going with the "normal" maintenance schedule versus the "severe" one. Obviously, by cutting the oil changes in half, I'll be not only saving money, but also the environment (less oil waste). I do not meet any of the "severe" criteria listed, so do you think it would be fine going with oil changes every 7500 miles instead? I use Purolator oil filters and regular dino oil. According to most motor oil companies and mechanics, they recommend changing the oil every 3000 miles or 3 months. Obviously, it's in their best interest for people to do that.