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Old 02-06-2015, 12:56 PM   #8
hancock1701
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Join Date: May 2013
Location: Orange County, California
Posts: 266
I was changing my oil at 5000 miles or every 6 months, but I forgot one time and let the oil go up to 9000 miles. Had the 9000 mile oil tested by Blackstone and all the characteristics were still good. Oil was Mobil1 0W40 and car is at 137,000 miles now.
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