This is all about oil and ZDDP (Zinc Dialkyl Dithio Phosphate). Very interesting and good reading material.

Please visit http://zddplus.com  for lot of info about their Zinc and Phosphor ZDDP product and ordering.

Here is a few docs I keep as a backup in case the info would become unavailable at time.

TechBrief1 - Introducing ZDDPlus.pdf

TechBrief2 - ZDDP and Cam Wear - Just Another Engine Oil Myth.pdf

TechBrief3 - Lubrication Terminology.pdf

TechBrief4 - Oil & Additive Testing.pdf

TechBrief5 - Racing Oil as a Replacement for SM Oil.pdf

TechBrief6 - Diesel Oil Use in Classic and High-Performance Gasoline Engines.pdf

TechBrief7 - Oil Additive Dosing and Dilution rev4.pdf

TechBrief8 - The Automotive and Oil Industry vs. the Aftermarket Viewpoint on ZDDP.pdf

TechBrief9 - ZDDP and Oil Filters.pdf

TechBrief10 - Oil Base Stocks.pdf

TechBrief11 - Internal Combustion Engine Lubrication.pdf

TechBrief12 - ZDDP and Engine Break-in.pdf

TechBrief13 - Oil Viscosity.pdf

TechBrief14 - ZDDP and Pre-WWII Engines.pdf

TechBrief15 - Extended Oil Change Intervals.pdf

 

And this is in Dutch:

Info over ZDDP in Olie voor klassiekers.pdf