<div dir="ltr"><div>Oil technology is changing quickly, with the change in emissions and fuel economy regulations and the redesign of newer engines.  Additive packages are now designed for engines that run hotter, have tighter tolerances, and must be cleaner to preserve catalytic converters and oxygen sensors. It's easy to think in terms of individual brands that have "always been good", but the thing that most affects the choice of oil is the API Service Classification. </div><div>I found a good summary of the rapid changes in oil standards here:</div><div><a href="http://www.pqiamerica.com/apiserviceclass.htm">http://www.pqiamerica.com/apiserviceclass.htm</a><br></div><div>As classifications change, old oil formulations become obsolete, the appropriate oil for flat tappet engines has become pretty much the product of specialty oil companies like Royal Purple, Driven/Joe Gibbs, Red Line, Lucas, and Collectors Choice (Moss).<br></div><div><br></div>Chris<div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Jul 5, 2019 at 10:32 PM Charley Robinson via Mgs <<a href="mailto:mgs@autox.team.net">mgs@autox.team.net</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
  
    
  
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    I've been reading up on it to refresh my memory.  A lot of folks
    just take other peoples' word for it.<br>
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    CR<br>
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    <div class="gmail-m_-7918293755375773193moz-cite-prefix">On 7/5/2019 9:02 PM, Max Heim via Mgs
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      Only certain weights. You have to read the labels, or usually the
      spec sheets.
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          <div>--</div>
          <div>Max Heim</div>
          <div><a href="mailto:mvheim@sonic.net" target="_blank">mvheim@sonic.net</a></div>
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            <div>On Jul 5, 2019, at 6:15 PM, FrankK <<a href="mailto:frankk12@verizon.net" target="_blank">frankk12@verizon.net</a>>
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                    <div>I assume all those brands include the
                      correct ZDDP proportions./ </div>
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                          <div><b>From:</b> <a title="mvheim@sonic.net">Max Heim</a> </div>
                          <div><b>Sent:</b> Friday,
                            July 5, 2019 9:02 PM</div>
                          <div><b>To:</b> <a title="frankk12@verizon.net">FrankK</a> ; <a title="mgs@autox.team.net">MG List</a> </div>
                          <div><b>Subject:</b> Re:
                            [Mgs] Oil Additive</div>
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                    <div style="font-size:small;text-decoration:none;font-family:Calibri;font-weight:normal;font-style:normal;display:inline">Right,
                      but there are other brands. I use Mobil1 15W50.
                      Others use Royal Purple, Joe Gibbs, Kendall or
                      AMSoil brands.
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                          <div>--</div>
                          <div>Max Heim</div>
                          <div><a>mvheim@sonic.net</a></div>
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