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<DIV>From what I’ve read flat tappet cams aren’t really flat and neither are the
lifters. The cam is ground with a slight angle on its surface and the lifter is
slightly convex. Both enhance the spinning of the lifter on the cam. Many (I
know I use to) likely assume the lifter stays relatively stationary and “slides”
on the cam based on the normal description. One product that I’ve heard
about is GM EOS (engine oil supplement). This is the link (Summit) and the write
up. <A title=http://www.summitracing.com/parts/nal-88862586
href="http://www.summitracing.com/parts/nal-88862586">http://www.summitracing.com/parts/nal-88862586</A>
“ <FONT face="Times New Roman">Protect your engine with a bottle of proven
Chevrolet Performance E.O.S. additive to keep your engine running smoothly and
efficiently. This Engine Oil Supplement is recommended to be installed <U>before
firing a new engine equipped with a Chevrolet Performance camshaft</U>.
</FONT><FONT face="Times New Roman">I used this when I broke in a new cam. In
addition to the 2,000-2,500 RPM break in process I set the idle at about 1,000
RPM for the first 1,000 miles.</FONT></DIV>
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<DIV><FONT face="Times New Roman">As far as the diesel oils go (Rotella etc.)
I’ve heard that they too have reduced ZDDP also now that those vehicle are
running some form of CATs. Maybe oil should be labeled like food so we know
specifically what is in it. What I find interesting is I’ve never seen an
additive bottle that stated not to use it in a modern (CAT) car. Yet they
are requiring it removed from oil to protect the CAT??? Hummm... .
The oil additive debate seems to follow the same course like the need for
supplement vitamins.</FONT></DIV>
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<DIV style="font-color: black"><B>From:</B> <A title=tigers@autox.team.net
href="mailto:tigers@autox.team.net">Tod Brown via Tigers</A> </DIV>
<DIV><B>Sent:</B> Saturday, November 14, 2015 2:19 PM</DIV>
<DIV><B>To:</B> <A title=tigers@autox.team.net
href="mailto:tigers@autox.team.net">tigers@autox.team.net</A> </DIV>
<DIV><B>Subject:</B> Re: [Tigers] Motor Oil</DIV></DIV></DIV>
<DIV> </DIV></DIV>
<DIV
style='FONT-SIZE: small; TEXT-DECORATION: none; FONT-FAMILY: "Calibri"; FONT-WEIGHT: normal; COLOR: #000000; FONT-STYLE: normal; DISPLAY: inline'><FONT
face=Arial>My understanding is that the most important issue with flat-tappet
engines and lubrication is that<BR><FONT face=Arial>the initial br<FONT
face=Arial>e<FONT face=Arial>ak-in is crucial to longevity. For the
first</FONT></FONT></FONT> 1500-2000 miles <FONT face=Arial>of operation it is
extremely <BR><FONT face=Arial>important that the proper level of zinc additive
(i.e. zddp) be<FONT face=Arial> <FONT face=Arial>provided so that cam
surfaces<FONT face=Arial>, rings<BR><FONT face=Arial>and cylinder bores be
allowed to seat themselves. Newer oils are too slick to allow the
necessary<BR><FONT face=Arial>scuffing to take place, whereas the presence of
zddp provides enough friction for the seating to <BR><FONT face=Arial>take
place. Once past the initial break-in, zddp is no longer as necessary. I have
not seen a definitive<BR><FONT face=Arial>statement as to whether zddp is
necessary after break-in but many sources recommend that an<BR><FONT
face=Arial>oil with higher levels of zddp be used. <BR><BR><FONT face=Arial>I
found the discussion at <A
href="http://www.hotrod.com/how-to/engine/ccrp-0702-break-in-new-cam/"><A
class=moz-txt-link-freetext
href="http://www.hotrod.com/how-to/engine/ccrp-0702-break-in-new-cam/">http://www.hotrod.com/how-to/engine/ccrp-0702-break-in-new-cam/</A></A><BR><FONT
face=Arial>to be helpful. Note that<FONT face=Arial>, at the end of the article,
there are some recommendations for oils with<BR><FONT face=Arial>higher levels
of zddp, usually used in diesel engines. <BR><BR><FONT
face=Arial>Cheers,<BR><BR><FONT face=Arial>Tod Brown<BR><FONT
face=Arial>B382002384LRXFE<BR><FONT face=Arial>TAC
#864</FONT><BR></FONT></FONT></FONT></FONT></FONT></FONT></FONT></FONT></FONT></FONT></FONT></FONT></FONT></FONT></FONT></FONT></FONT></FONT>
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