John,
Chevron will continue to produce both the CI-4 Plus and the CJ-4 formulations. Hopefully retailers are aware of the need for both formulations, or we need to make them and other home mechanics aware.
The sales literature and product data sheets for the new CJ-4 diesel engine oil formulations are very slickly written. But an informed person can read between the lines. They have to meet government guidelines for new diesel engine oil emission standards, and sell well among their competitors (Chevron, Shell, etc), so lubrication manufacturers are caught in the middle.
ZDP has been the icon anti-wear additive for engine and industrial oils for a long time, with proven results.
