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The socket that fits the NGK plugs for the GL450 is a 5/8". I notice on the box they indicate that the plugs are pre gapped at the factory and there is no need to gap the new plugs, I think that platinum plugs are always this way... the gap is already correct. Nice, because that means less work and more perfection!
 

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Discussion Starter #7
The socket that fits the NGK plugs for the GL450 is a 5/8". I notice on the box they indicate that the plugs are pre gapped at the factory and there is no need to gap the new plugs, I think that platinum plugs are always this way... the gap is already correct. Nice, because that means less work and more perfection!


Thank you for this information. I changed the spark plugs successfully and car sounds and responds like the day it was made.
Thanks again, man
 
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