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      09-17-2018, 11:23 AM   #31
cahme
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Drives: '11 E90 335i Sport MT
Join Date: Jul 2015
Location: Texas

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Since I see lots of reference to "one step colder" with no reference to part numbers, I wanted to point out that on the BMS website it's all relative to the stock N54 plugs.
So the: "NGK 5992 1-Step Colder Spark Plug" is actually the same heat range as the stock N55 ZR5TPP33S plug.

One step colder would be the NGK 97506 N20 replacement ones.
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