<VV> Fully broken in and ready for synthetic oil/engine wear points

[HallGrenn at aol.com]

In a message dated 3/17/2011 4:36:10 P.M. Eastern Daylight Time,  
bryan at skiblack.com writes:

Yes.  As I understand it the additive is needed in all oils,  it protects 
parts under extreme pressure which is a function of engine design,  not oil 
type.  The amount of ZDDP is listed on some oil makers'  websites.





To take Bryan's point further I have read that the higher amounts  of ZDDP 
necessary for older engines (like ours) is to protect the wear  surfaces of 
our flat tappets (lifters) at the cam.  Almost all vehicles  since 1994 have 
roller tappets which do not need the higher ZDDP levels.   ZDDP 
contaminates catalytic converters over time and manufacturers have to  certify that 
their converters will last much longer now--150K miles now if  memory serves.  
But are there any other wear points beside the cam  lobe/flat tappet point 
in our engines (or engines of the period) that  also require the higher ZDDP 
because of high loading?  The rocker  arms, push rods and pivot balls 
perhaps?
 
Bob Hall
Group Corvair
Corvanatics
CORSA