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every 3,000 mi. and filter running conventional oil; Every 5,000 miles and filter with full synthetic oil.

the new trend is every 3000 miles or every 3 months. Personally, I am always poor, I do every 5000 miles or 4 months. my 2004 Mazda 3 still run it best.

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12y ago
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Q: How often should you change your oil in 2004 Mazda 3?
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