Oils like Redline and Shaeffer's still have large amounts of ZDDP and Moly. My motor still runs Flat tappets, so I opted to use Redline.
"To prevent excess wear, traditional motor oil included a generous dose of antiwear additives, primarily zinc dialkyldithiophosphate (ZDDP). "The chemistry is such that the additive is a combination of zinc and phosphorous," says Rockett Racing Fuel's TimWusz." - Hot Rod Magazine
http://www.hotrod.com/techarticles/engine/flat_tappet_cam_tech/index.html
In this same article, they talk about the decrease in Moly and ZDDP to meet emissions standards.
"Although great for keeping a flat tappet alive, as an engine ages and develops blow-by, some of the additives flow out the exhaust where they can degrade oxygen sensor and catalytic converter performance.Faced with ever more stringent emissions standards and the governmental mandate for extended emissions-control- system warranties, the OEMs got together with the motor oil makers and decided to reduce the amount of ZDDP in street-legal, gasoline-engine motor oils. After all, theyweren't needed with modern roller lifters and overhead-cam followers.The reduction first started in the mid-'80s, and it has been a gradual process, but the latest API SM and GF-4 specs have reduced ZDDP content to such an extent that the new oils may not provide adequate protection for older, flat-tappet-equipped vehicles" - Hot Rod Magazine.
I'm concerned with the possibility of buying a new converter in my near future due to Redline's increased ZDDP and Moly. Do any of you have long-term experience with ZDDP dense oils? How did your emissions and cat converter fare? Can I continue to use Redline without having an annual cat replacement?
"To prevent excess wear, traditional motor oil included a generous dose of antiwear additives, primarily zinc dialkyldithiophosphate (ZDDP). "The chemistry is such that the additive is a combination of zinc and phosphorous," says Rockett Racing Fuel's TimWusz." - Hot Rod Magazine
http://www.hotrod.com/techarticles/engine/flat_tappet_cam_tech/index.html
In this same article, they talk about the decrease in Moly and ZDDP to meet emissions standards.
"Although great for keeping a flat tappet alive, as an engine ages and develops blow-by, some of the additives flow out the exhaust where they can degrade oxygen sensor and catalytic converter performance.Faced with ever more stringent emissions standards and the governmental mandate for extended emissions-control- system warranties, the OEMs got together with the motor oil makers and decided to reduce the amount of ZDDP in street-legal, gasoline-engine motor oils. After all, theyweren't needed with modern roller lifters and overhead-cam followers.The reduction first started in the mid-'80s, and it has been a gradual process, but the latest API SM and GF-4 specs have reduced ZDDP content to such an extent that the new oils may not provide adequate protection for older, flat-tappet-equipped vehicles" - Hot Rod Magazine.
I'm concerned with the possibility of buying a new converter in my near future due to Redline's increased ZDDP and Moly. Do any of you have long-term experience with ZDDP dense oils? How did your emissions and cat converter fare? Can I continue to use Redline without having an annual cat replacement?
