Hey Cisco, we were talking about this the other day, i never got a chance to finish. The reason Plat +4 plugs are no good for Bimmers is due to the ignition system. The BMW ignition system doesn't output near the voltage of a lot of American cars. Thusly, there is not enough voltage to utilize a four electrode platinum plug.
Unless you plan on going to an aftermarket plasma ignition system i would just use the oem plug .
Yeah bosch +2 copper are the OE replacement, I know they don't cost and arm or leg but I don't want to replace that often atleast a year or two etc. Unless you have lots of time to kill. I'm meticulous about my car but I'm lazi too! hehehehehe
I don't know man, I would probably go back to the oem plug, if you wait a little while i will post a picture of 'em. The reason being, you won't find them at autozone, i tried. So i will show you what to go "hunt" for. The tech i talked to made sense, he said these cars are pretty well tuned, and when you start
f@#$knig around with them, you usually wind up with adverse effects. ghead
I had all the same questions like you etc. exactly and many others...I mainly see NGK for imports etc. BOSCH and BERU for European cars...I just stuck with OE requirements thats Bosch!....Stick with +2 bosch copper or platinum...not +4. Choosing the most efficient sparkplugs will give better spark,fuel economy etc. but it doesn't give you HP!!!
The AutoGuide.com network consists of the largest network of enthusiast-owned enthusiast-operated automotive communities.
AutoGuide.com provides the latest car reviews, auto show coverage, new car prices, and automotive news. The AutoGuide network operates more than 100 automotive forums where our users consult peers for shopping information and advice, and share opinions as a community.