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I bought my used Boxster when it was at 49k miles. Of the six oil changes, only two were synthetic mobil1. The rest were of high quality regular oil. Now, the mileage is at 100k miles with no issue. I will continue to use regular oil and save a ton of money. I think synthetic is overkill if the oil change internal is anything less than 7k milles. Just my 2 cents....
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