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Neither FCP Euro, or any other reputable retailer, would knowingly sell counterfeit plugs.
How do you know the previous owner ran only 89 octane?
Cracked insulator is almost always user error on install or removal.
LSPI wouldn't damage a plug and these engines aren't known for having LSPI issues. A LSPI event wouldn't occur at 4k rpm anyways. It's too high by a factor of 2.
My guess is that the previous owner tuned the vehicle and/or abused it. The previous owner or the dealer could've flashed it back to stock.
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"Drive more, worry less. "
435i, MPPK, MPE, M-Sport Line
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