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Mobil is an A40 Porsche approved oil. Use their 5W50 and change it every 5,000 miles, or at least yearly for low mileage cars. If driven during the winter months, change over to the 0W40 for that period, then go back to the 5W50 in the spring. Catch in on sale ($6/L) at places like Napa, and a couple times per year you can double-dip and get a $12 rebate (then it's <$4/L) for a purchase of 5 or more quarts. You won't have an "oil related failure" if you do this.
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