The reason I use one is because of the miles I drive. I'll usually run about 10,000 miles a month. My truck is just over 3 months old and I have almost 33,000 miles on it. Just don't want to spend all my time changing oil. With the bypass setup I can go a long time between oil changes. Don't know exactly how long it will be on this new engine, but will go with the oil analysis and go from there.