It's better than nothing, which is what 99% of cars get. For sure it's like brushing your teeth vs visiting the dentist for that awesome and fun ultrasonic clean, but who honestly has time to take the whole mani off routinely? I've pulled mine once, and I was happy my car buildup is low, so cans for me in-between, and a pull every 50 thou / Christmas holiday or so. But then I run serial catch cans, further helping lower the problem.