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Also, and this will cause a tremendous amount of heartburn with my fellow 1M owners, the need to change oil, or interval, is nowhere near 5K miles unless you are running the car hard (tracking). For years I used AmsOil synthetic in my heavy duty diesels and had the oil analyzed by the company. Assuming street use (yes you can drive it fast) and normal filter replacements at ~5K miles, the synthetic oil is still very good at the 20,000 mile mark. The whole notion of changing oil super frequently is just a waste of money, even though it makes us feel good. If you want to challenge this notion, submit samples of your motor oil for analysis. The results will surprise you. Synthetic oil is absolutely the best thing to ever hit the market.
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