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Synthetic oil is not bad for your car. I would probably stay away from those mechanics. But, if you change your oil every 3000 miles, you probably don't need it. I'm kinda anal though, i use synthetic and still change it every 3000 miles.
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2002 G20 w/sport package.
1993 Mustang coupe 5.0(of course) with Vortech and too much to list.
Service Advisor for Infiniti
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