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I have a friend who owns a Ford van with 580,000 miles on it. He changes the oil every 15,000 miles. He uses regular oil not synthetic. It’s the 5.4 engine not a great engine to begin with. It’s never been rebuilt and doesn’t use any oil. Sure synthetic is better but do you need it. I use synthetic to but I’m not sure you need it. I certainly wouldn’t change oil more frequently than the manufacturer recommends.
Lynwood
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