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Good question. IIRC I lost my first coil at 283,000. I replaced the whole rack based on the mileage and the cost of towing back to home if I lost one at work, which is 80 miles away. Coil death has many variables, but age is one of them. The cost of a tow was the price for 6 coils, so it made sense to replace them in my situation. I've done plugs near the 100K interval for the 2 times I've done them. Modern day engine controls don't wear out plugs like back in the day.
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