Well, it is supposed to use in old engine and fix some small leaks. But lots of people mentioned that it's a group IV, which might cause leaks in old engine. How does valvoline solve this problem?
I thought about this when Maxlife Syn first came out, and I figured that they wouldn't advertise it as Maxlife if it would make a small leak bigger like happens in some cases with a regular synthetic. I doubt there's anything to worry about.