Oil Additives Solid Cam??

fjr said
The anti-wear component of ZDDP is phosphorus and not zinc.
http://www.valvoline.com/faqs/motor-oil/racing-oil/73 (See What is zinc?)

The base oil is also an important factor in an oil's anti-wear protection. If you are so concerned about ZDDP (or phosphorus), maybe should be looking at other HDEOs.

Chevron Delo 400 0W-30 contains 1140 ppm of P

Esso XD-3 Extra 0W-30 contains 1110 ppm of P

The API service categories are PERFORMANCE specifications rather than FORMULATION specifications. It doesn't matter how the oil additive package is formulated if it meets or exceeds the performance criteria. The phosphorus limit is purely for emission reasons as you have suggested.

Whether it's the zinc component or the phosphorus, Hughes Engines says it's the Zinc, that is the anti wear component doesn't matter a hill of beans because both find their way into the oil using one additive, ZDDP. The point of this thread is the reductions of the package in oils being sold today both north and south of the border. So FJR if you want to sit here and debate black is black but sometimes white according to this writeup do it with someone else. By the way I used to work for Imperial Oil and during those 20 years would never use any of their oils being sold to the public mostly because of crap found in their supposed brand new, fresh from the refinery, barreled oils. This was confirmed by third party laboratory testing. Have a nice day.

http://www.hughesengines.com/TechArticles/207engineoilsflattappetcamszinc.php

Terry