Lucas Response To Zinc Additive

Amsoil has an assortment of synthetic oils with a reasonably high zinc and phosphorous content. It can be difficult to know exactly what our favorite oil has without an oil analysis or recent published figures. As noted, most newer oils, including diesel oils, have reduced levels. But before buying additives for each oil change and possibly altering what the oil manufacturers engineered into their oil, crunch some numbers to see if it is cost effective compared to "factory" zinc/ phosphorous enhanced oils. However, for break-in, I will likely add something to the temporary, conventional break-in oil after my older stock runs out. Then I use synthetics.

Newer vehicles also have gone to roller lifters on one of the highest pressure points in an engine, so they don't need high zinc levels. And there is the emissions/catalytic converter issue.

Smart, but sometimes labor-intensive, break-in proceedures are a big factor in long cam life. High zinc oils are added insurance. Obviously, I think Amsoil synthetics are the best insurance. But at least we can all share our info so others can make their own educated decisions.

High zinc Amsoil products:
https://www.amsoil.com/dealer/techservicesbulletin/MotorOil/TSB MO-2007-08-08 Flat Tappet.pdf

Amsoil source & info:
www.thelubepage.com