<VV> Fully broken in and ready for synthetic oil/engine wear points
HallGrenn at aol.com
HallGrenn at aol.com
Thu Mar 17 17:52:24 EDT 2011
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
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