O.K. spent alot of time reading on this subject. Just how critical is oil phosphorus content to converter life. I'm not a fan of "cat friendly" oils but then again I'd rather not have to replace pre-cat and downstream cats at 50,000 miles. Is my concern real or perceived? Should I worry about oils like Synergyn,Redline and Amsoil damaging my cats or not? I know protecting catalytic converters was a major reason behind lowering ZDDP adds. Starting in 2004 I believe manufacturers were required to warranty cats out to 120,000 miles.
[ May 09, 2005, 07:18 PM: Message edited by: sully ]
[ May 09, 2005, 07:18 PM: Message edited by: sully ]