Oil Additive

Hi You don't need adatives if you are using the right oil for the right application.flat tappet cams need zink phosphate.Most newer oils don't have enough. They lowerd the zink phosphate content to protect the catalitic converters.The raceing oils still have it and some of the high mileage engine oils do. their is a very good article about it at (classic car motor oil .com)sorry i don't no how to post the link but it is worth reading.