Originally Posted by Indo Rider
Dack, seriously, why do you keep spreading fear about spark plugs not purchased from dealership? There are tons of people using plugs sourced from plenty other places with no problems. You keep spreading this misinformation and have never provided any quantitative information about alleged difference. Your position is based on a handful of stories about folks who had misfires. There are equally as many stories about folks who have had misfire issues with bmw sourced plugs. The guy on page 2 of your DIY even admitted that he put the original plugs back in before he gave up and took car to dealer. Seriously, i dont mean to be a dick about it, but for the love of god please post some hard data instead of regurgitating a bunch of hearsay.
I think we have two different
opinions on OE and OEM parts. I prefer to use only OE instead of factory seconds(OEM). Feel free to use what ever you like on your car.
IF you search over on the e90forum
... you will find some people who had issues with aftermarket plugs. The price difference isn't that great... and I did not feel like re-doing the job a week or month or two later. I'd rather do a repair/maintenance job ONCE.