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Why is it that Audi recommend you replace your spark plugs at 40k and vehicles like Honda / Acura. Recommend them at 100k do they use a cheaper plugs or is it over selling ?
The vehicle recommended spark plug replacement schedule by the manufacturer is for a reason. The vehicle may carbon or oil foul the plugs before 50 or 60k, and this is the reason the interval is set to 40k. You can try and leave them in longer but they may start misfiring.
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