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      12-04-2012, 01:42 PM   #97
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Drives: N54 e82
Join Date: Feb 2010
Location: Bayern, Germany

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Originally Posted by kiwi29 View Post
Question, I know this is a n54/55 based thread but how tight do you torque on the plugs for n51s/52? I read earlier a guy saying 30nm but I just want to confirm and see if someone knows how much that is in ft./lb. or in./lb.?
And also, is it possible to use 335 spark plugs for a 328? If so, would it be worth it? Will it create better performance and how tight do I torque it?

For the N55/N54 spark plugs they should be torqued to 23Nm.

23Nm = 17 Ft/Lbs. BMW stamps the torque right on the spark plug box.

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DO NOT use spark plugs for a turbo engine in an NA engine!!! Make sure you use the correct plugs for your engine. Sometimes this changes for SULEV and ULEV cars too. So check with your dealer via your VIN. There is no magical secret power to be found by using different plugs. That was a myth used to sell those V-grooved plugs from years ago.

Just by changing your old worn spark plugs, your engine will feel stronger. Always use OE spark plugs!