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Message: <blockquote data-quote="dru" data-source="post: 1903325" data-attributes="member: 3047">I have a 2007 saturn ion with 86,xxx miles on it.  It has had regular oil changes every 3000-4000 miles.  not really driven heavily, and most of those miles are highway to begin with.  I have decided to start doing my own oil changes after getting jerked around by a few oil shops in town and was wondering about the wisdom of using synthetic oil.  Up to this point it has been conventional oil AFAIK (its my wife's daily driver).Will this cause problems on my car?  I have heard conflicting things about switching to synthetic causing engine leaks (or not), and causing gunk to dislodge and block circulation of oil (or not).  some have said do it, others have said they started having leaks shortly after.  A few of my neighbors have recommended going ahead and doing a change to synthetic now, and then after a few hundred miles, changing the oil with fresh synthetic to get most of the dislodged crap out.So before I go ahead and create a problem for myself, was wondering what people here thought.  I trust stuff here a little more than random internet forums and yahoo answers. <img src="/images/smilies/smile.png"  class="smilie" loading="lazy" alt=":)" title="Smile    :)" data-shortname=":)" />Also, what is a good high quality filter to use?</blockquote>