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<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>
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