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Message: <blockquote data-quote="Stepside" data-source="post: 124210" data-attributes="member: 2463"><img src="/styles/default/xenforo/smilies/yawn.gif"  class="smilie" loading="lazy" alt=":yawn:" title="Yawn    :yawn:" data-shortname=":yawn:" /> I use a 'Group III' oil and have been since the 60s.I have seen & inspected the insides of engines using 'Group III' oil.It has a higher API rating than many 'Group IV' synthetics . . .besides . . <img src="/styles/default/xenforo/smilies/birgits_tiredcoffee.gif"  class="smilie" loading="lazy" alt=":birgits_tiredcoffee" title="Birgits Tiredcoffee    :birgits_tiredcoffee" data-shortname=":birgits_tiredcoffee" /> my engine likes the feel of Zinc dialkyldithiophosphate.----- just my opinion/experience -----<img src="/styles/default/xenforo/smilies/patriot.gif"  class="smilie" loading="lazy" alt=":patriot:" title="Patriot    :patriot:" data-shortname=":patriot:" /></blockquote>