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OEM is where I'm leaning. I have iridium plugs in the IS300, but that's just because they're OE and last around 100k miles.
I've been looking at the Bosch plugs and have come up with two part numbers - 7413 and 4417. Local places stock the 4417, but online places list the 7413. Both are platinum +4, and I assume both are a 7 on the heat scale. Do you know the difference?
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