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One important point to keep in mind with respect to Bosch Platinum IR Fusion, Platinum+4 and Platinum+2 plugs is that these plugs are pre-gapped at the factory to a uniform 1.6 mm setting and should not be re-gapped to the specifications for a standard spark plug. It's very difficult to get even spacing with multiple electrodes so install them without changing the electrode gaps.
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1993 Celica ST-------------- Successfully swapped A 5afe 1.5L works great!
1992 Celica ST-------------- Daily Driver 236,000 miles currently
1991 Celica Convertible---- Father's daily driver
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