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Message: <blockquote data-quote="Bill Ellis" data-source="post: 542564" data-attributes="member: 59929"><p>Actually, if you change oil as recommended you can switch as much as you want. All the name brand dino and syn oils are fully compatable with one another and your engine won't care what's in there as long as it hasn't gone past it's service life. In fact, if you do change oil at the recommended intervals, there is little evidence that full syns are of any noticable benefit in terms of improved mpg or reduced engine wear. This is one of those emotional issues for the most part. If you use any oil that meets the service duty specs and change it as recommended, you will never have an oil related engine failure; just doesn't happen.</p></blockquote><p></p>