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    Its not a synthetic. <a
href="https://cglapps.chevron.com/sdspds/PDSDetailPage.aspx?docDataId=77118&docFormat=PDF">https://cglapps.chevron.com/sdspds/PDSDetailPage.aspx?docDataId=77118&docFormat=PDF</a><br>
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    <div class="moz-cite-prefix">On 8/15/2020 4:45 PM, Doug Tallman
      wrote:<br>
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      cite="mid:deb32389-77ef-8aea-3f88-06e20b670182@accnorwalk.com">
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      <p><font size="+1">I would say the problem is the synthetic oil.
          It is too slick for some engines. A buddy bought a fairly new
          motorhome with the GM 8.1. Since he wanted it to last he
          changed to synthetic oil. First trip out they coated the tow
          car with oil coming out the back. Dang the rotten luck, pulled
          the trans and replaced the rear main. No other signs of leaks.
          Next trip it was the same thing. With some research he found
          that GM recommended not using synthetic. Changed back to
          regular oil and problem solved.  Doug T</font><br>
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      <div class="moz-cite-prefix">On 8/15/2020 12:57 PM, John Hall
        wrote:<br>
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      <blockquote type="cite"
        cite="mid:1b1d1e0e-653f-5219-7b85-e74c7473bde9@nc.rr.com">Chevron
        Dello 400</blockquote>
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