Originally Posted by Fed P
Unless this is another case of Dackelone's "use only BMW spark plugs, not Bosch". IIRC, BMS sells the Bosch ones.
I was just gonna say....
There is a KNOWN
problem with aftermarket spark plugs. BUY plugs from a BMW dealer only. Don't you think its wiser to spend $90 on OE plugs than (cheap) OEM ones. ?
Read post #45
135i Spark Plug replacement DIY...
There are also N55 and N54 specific plugs. Check your part numbers to make sure you get the correct ones. See page two of my DIY.