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My dad has spoken of horror stories about the slit style plugs arcing to the piston rather than the ground electrode and over time burning a hold in the piston. I don't know where his source is, but he just got a car that OEM calls for a split plug, but also accepts 6 other designs, including an older model plug which he bought whole sale that uses single electrodes. Car is a 1998 Camry, older style is 92-96 camry.
In either case, I would be sure to atleast stick to a plug that the OEM says to use unless there is good proof it is a bad pick.
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