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Message: <blockquote data-quote="Ken Stewart" data-source="post: 601058" data-attributes="member: 62102"><p>Set up my 20K service for this coming weekend.  While on the phone, I asked about when to change over to synthetic vice regular crude ... technician said Ford says to only use synthetic blend and not pure synthetic.  He also said it may void warranty if I go full synthetic.  I don't have the first clue about which is better so someone in the know hit me w/some info please <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin    :D" loading="lazy" data-shortname=":D" /></p></blockquote><p></p>