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I would be more concerned about your filter than your oil. Synthetics are great, but a crappy filter can still cause problems. I have actually run synthetic and just changed the filter instead of the oil, and topped up as needed. But on dino oil I still try to change it at 3000 miles for what it's worth. Probably not needed, but it is cheap insurance.
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"Don't look for one place to lose 100 pounds, look for 1600 places to lose an ounce." - Tony DeFeo
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