<div dir="ltr"><div class="gmail_default" style="color:#3333ff">I believe in an earlier message someone said that they use Rotella diesel oil to get the desired zinc, etc. levels. Rotella--and other similar HD diesel lubes--have also had their zinc, etc. levels limited by EPA standards and are not what they used to be.</div><div class="gmail_default" style="color:#3333ff"><br></div><div class="gmail_default" style="color:#3333ff">Best--Michael Oritt</div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Jun 10, 2015 at 4:08 PM, Albert Seminatore <span dir="ltr"><<a href="mailto:alsemus1@gmail.com" target="_blank">alsemus1@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><p class="MsoNormal"><span>The following is a response from Castrol regarding the best oil to use for classics. For me this clarified a lot of what I heard but didn't know the reasons. Hope this helps others.<span style="background-color:rgb(56,118,29)"><span></span></span><br></span></p><p class="MsoNormal"><span><br></span></p><br><p class="MsoNormal"><span>Classic
cars with flat tappet cam engines represent a special case in regards
to engine oil lubrication. These engines have valve train configurations
that require elevated levels of ZDDP (zinc dialkyl dithiophosphate)
anti-wear for proper protection of the flat tappet camshaft and its
lifters. Insufficient concentration of ZDDP will lead to premature wear
and failure of the camshaft and lifters. Current GF-4 and GF-5 fuel
economy grade engine oils are designed for extended life of the
catalytic convertors in modern passenger cars and have industry mandated
limitations on the amount of sulfur and phosphorus within the oil. </span></p><p class="MsoNormal"><span> </span></p><p class="MsoNormal"><span>Only
Castrol EDGE 5W-50 has a boosted level of ZDDP (1250 ppm) to help
protect flat tappet cam engines in classic cars. This engine oil is a
full synthetic, has excellent cold temperature properties, and has a
high temperature viscosity (SAE 50) that is suitable for use in many
classic car applications.</span></p><p class="MsoNormal"><span> </span></p><p class="MsoNormal"><span>Castrol EDGE 0W-30 oil is not recommended for use in a flat tappet cam engine.</span></p><p class="MsoNormal"><span> </span></p><p class="MsoNormal"><span>Castrol
always recommends following the guidelines of the engine manufacturer
for the recommended oil (i.e. SAE grade, API rating and manufacturer
specifications) specific to your application or please consult your
mechanic as to the suitability of the 5W-50 viscosity grade in your
engine.</span></p><p class="MsoNormal"><span> </span></p><p class="MsoNormal"><span>Thank you again for contacting Castrol, we value your patronage!</span></p><p class="MsoNormal"><span> </span></p><span>Castrol Consumer Relations</span><span><font color="#888888"><span><br clear="all"></span><br>-- <span style="background-color:rgb(243,243,243)"><span><span style="background-color:rgb(238,238,238)"><span style="background-color:rgb(243,243,243)"></span></span></span></span><br><div><div dir="ltr"><div><div><span style="font-family:garamond,serif">Albert Seminatore</span><br></div>Mountain Falls, Pahrump, NV<br></div>eMail: <a href="mailto:alsemus1@gmail.com" target="_blank">alsemus1@gmail.com</a><br></div></div>
</font></span></div>
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