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I have been BM3 93 Octane Stage 2 tune since 2018 with over 107k on the odometer. My spark plug NGK interval which is gapped to .020 have been every 20,000-30,000 miles or 3 oil changes or about every 2-3 years. I mostly daily my car with some spirited driving here and there but nothing crazy. I would have to agree with SYT_Shadow if your tracking the car multipe times a year I would definitely replace yearly.
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