Quote:
Originally Posted by e34m5
For reasons unknown there seems to be some reason that the BMW labeled plugs, albeit with the exact same Bosch number are not in fact identical.
I used the Bosch version the first replacement and BMW the second time. Can't tell any difference in performance.
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Usually the only time you can tell that someone used the Bosch plugs, is because after the installation they have drivability issues that were not there before. Some people had then replaced coil packs and injectors only to find out(later) that is was their aftermarket Bosch spark plugs.
I don't know why that is, but its been reported here(and on the e90post) forum many times. I think I saw someone post a picture of the ceramic insulator(cut in half down the plug) - and the BMW looked different on the inside than the Bosch one.
Dack