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You should use the oil recommended in the owners manual. If you don't have one, get one from MOTORLIT.COM. No. The use, or not, of synthetic oil is completely up to you as the owner of the vehicle, and has no effect, good or bad, on your vehicle's warranty. Warranty terms cannot compel you to use specific brands or types of oil, only the viscosity(5W30, 10W30, etc.).

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โˆ™ 2015-07-15 20:54:55
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Q: Do you have to use synthetic oil on a 2000 Cougar?
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