My mechanic made me aware of a problem they have been seeing over the past
few years. They have had a few ruined camshafts popping up, he told me
about this article in the July? issue of Hot Rod. Basically they have
removed most of the additives from the oil. My mechanic has been using
Castrol for 30 years and had to stop. He switched me to Rotella T for
diesel.
HYPERLINK
"http://www.hotrod.com/techarticles/engine/flat_tappet_cam_tech/index.html"h
ttp://www.hotrod.com/techarticles/engine/flat_tappet_cam_tech/index.html
hotrod.com/techarticles/engine/flat_tappet_cam_tech/index.html
This is an excerpt
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, they weren'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 running nonstock, performance cams and valvetrains. And it will
only get worse; projected future oil spec revisions will likely reduce ZDDP
content even more.
I dont recall seeing this on list before, so I wanted to make sure more
people were aware. Im sure Steve can fill us in a little more on this
subject.
Thanks,
Bruce
B9470147
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