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That's the MG Rover part number. NGK or Unipart, ETC will have a plug that can be referenced using that part number and will have it's own part number as well.

This is good :

http://www.ngkpartfinder.co.uk/

I believe this is what your'e after :

http://www.ngkpartfinder.co.uk/car_commercial_search.php?type=SPARK%2520PLUGS&manufact=MG&model=ZR%2520120&engine=1.8

Interestingly, The Rover 218 search I did, Before I realized that you have a Zed, Brought up the same NGK part number and had a note that said "All models, Including VVC."

NLP100290 are usually boxed MG Rover spark plugs.
 

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mg_zs
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If your car has a wasted spark system (two coil packs at the top of the engine, under the cover, no distributor), you might be better off with the standard NGK BKR6E. If you want platinum then NGK PFR6N-11 (longer service life).

However the NGK Iridium has a small centre electrode, and will be very similar to the problems of the NLP100290.

For a wasted spark system, the ultimate spark plug will be a double-platinum or double iridium electrode.

See the link below for more information:
http://forums.mg-rover.org/showthread.php?t=255933
 

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Discussion Starter #5 (Edited)
If your car has a wasted spark system (two coil packs at the top of the engine, under the cover, no distributor), you might be better off with the standard NGK BKR6E. If you want platinum then NGK PFR6N-11 (longer service life).

However the NGK Iridium has a small centre electrode, and will be very similar to the problems of the NLP100290.

For a wasted spark system, the ultimate spark plug will be a double-platinum or double iridium electrode.

See the link below for more information:
http://forums.mg-rover.org/showthread.php?t=255933
so NLP100290 are a no no for a wasted spark system?

is there any performance advantage to using PFR6N-11, to using BKR6E?
 
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