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My Kia Rio owners manual says unless you race and have a pit crew, it's a waste of money to change oil more than every 5000 miles. I tried synthetic on a car before, couldn't tell the mileage difference so I stopped spending the big bucks.
Switched the wifes '90 Century to the store brand at Advance Auto Parts back in the mid-90's and change it and teh filter at 6000 miles. It's over 183,000 now and consumes almost no oil.
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