2nd Gen R56 Cooper S Most liked posts in thread: What is the best spark plug?

^^^ Stock OEM plugs. Call the good folks at eMINIparts.com they'll set you up.

http://www.eminiparts.com/

 

^^^ +1

 

First off.... Stick with the factory plugs....

Secondly, we have a library on the site... And you don't need a library card.... And the library is always open.... Unless Nathan is messing with the wires that run the site, he will shut down the power for awhile.... Here is a good read on sparking plugs from the library authored by Czar... A basic guide to Spark Plugs. - Library

Thirdly.... Contact one of our sponsors for the sparking plugs... They help keep the lights on in the forum....

 

Stock plugs for my '07S are NGK 5992. Can't find them any more --- when searching the NGK USA site the search comes up with a completely different stock number and corresponding IL***** number.

Stock plugs with a smaller gap work great in my highly modded N14, but I was searching for a detailed breakdown on the IL***** number to compare with a recommended colder plug.

 

^^^ NGK 5992 was replaced by 95770...
https://www.ngk.com/learning-center/article/458/discontinued-ngk-spark-plugs

Finding a colder heat range...
https://www.ngk.com/learning-center/article/200/how-do-i-find-a-colder-or-hotter-plug

standard would be heat range 7.... ILZKBR7B8DG Laser Iridium Plug
one colder would be 8..... ILZKBR8B8DG Laser Iridium Plug... But NGK doesn't seem to list a colder than standard plug,,,:confused5:

 

For a colder plug, take a look at NGK 1422 --- ILKR8E6. Only significant physical differences are the gap --- .024, and wrench needed --- ⅝" (16mm). Trick is to find a really thin-wall socket to fit into the head.

Haven't tried mine yet --- still working on other issues.

 

I run Brisk plugs, but I'm running a stage 3 tune so I wanted something with a little more.