There are likely a hundred oil threads on this forum. This is the most unique. My take, stick with synthetic, buy a lot of it when on sale at Walmart or wherever, and change it every 3K to 5K miles. The cost difference over the long hall will be negligible. If you are crawling under the car to change the filter you may as well change the oil.
Fresh, top quality oil is the cheapest engine insurance you can buy.
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