Synthetic oils

A-BOMB360 said

after your mech. cam is broken in you don't need zddp anymore. frankly, you shouldn't need zddp during breakin either. 40 years later I would think that castings would be much better. certainly todays oils are light years ahead of the "old school" oils.

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Wrong, I would suggest that before making statements such as "you shouldn't need the zddp (zinc) during breakin either" you read up on the subject. The skinney on todays oils is that the zinc is being removed plain and simple. Flat tappet cams and lifters need zinc on their contact surfaces to survive especially if running dual springs.

Here's one of many articles on the subject.:read2:

http://www.hughesengines.com/TechArticles/3engineoilsflattappetcamszinc.php