Looks like
Castrol sees a market as a consequence of the zinc "controversy". Check out the footnote - damaging to catalytic converters.
. . . high–zinc formula specially engineered for classic engines.
Key Benefits
- Contains increased zinc levels for extra engine wear prevention.
- Utilizes proprietary additives and base oils to reduce metal–on–metal contact of aging engine parts.
- Engineered to increase wear protection for classic cars with flat tappet camshafts.
* SYNTEC 20W–50 does not meet the catalyst compatibility requirements of vehicles manufactured since 1993.
This might be marketing hype but it will appeal to old car owners who are willing to pay a little more for insurance. I wonder if it will cost more than the Rotella formulation that contains zinc? I also wonder how long it will take for the companies who replied above to come up with their own (high-priced) zinc formulations?
