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I also use conventional oil and change it about every 3-4K miles and one of my cars is 20 years old with 481K+ miles on it with the original engine. People argue that you can run synthetic at longer change intervals which I guess is true, I could probably run conventional oil longer but I'd rather know there is clean oil going into the engine more often with less chance of unnecessary wear. If I were you I'd do what I felt most comfortable with.
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