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      04-05-2013, 04:45 PM   #1
Drives: 335i
Join Date: Jul 2005
Location: Bay Area, CA

Posts: 56
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Proper Spark Plug Gap for N55


What is the correct factory gap for N55 engine? Is it 0.7mm?

I'm a bit confused because I just ordered the ZR5TPP33S Bosch branded plugs from ECS and on the box its labeled 0.8mm

I measured them on a cheap spark plug gauge and they are indeed ~0.8mm

I then took my original plugs out of my engine and measured them at ~0.85mm!

The car only has 26K miles and my wife drives it most of the time, so can someone weigh in on what I should set the gap to?

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