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what is the best spark plug to use on a 420a?

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Hey Locke, can we marked this thread resolved so everyone knows, I hate having those reminders for threads which are dead.
 
I know that this is an very old post...
but I found this on the service manual
2.0L Engine (Turbo) 0.7-0.8 mm (.028-.030 i.n.)
2.0L Engine (Non-turbo) 1.22-1.35 mm (.048-,053 in.)
2.4L Engine 1.0-1.1 mm (.039-.043 in.)
 
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