Owner reviews for spark plug

Fresh AC Delco copper core plugs are all you need. Start with the stock replacements and go from there.

That said, make sure they use quality parts. BMW/Bosch spark plugs and OEM pulleys (and belt) are a must. NGK plugs are cheaper and don\u2019t last as long. Same goes for off-brand belts and pulleys.

New plugs and a fuel filter are all cheap and easy maintenance items that no ones done.

I just swapped out an original set from 2006 that had exactly 165,050 on them. Car still ran great before the swap.

Went with Bosh double platinum plugs at 60,000km when I notice a stumble at idle and that's the interval for change. I instantly went from best of 9.6L/100km to 7.8L/100km big difference in performance and smoothness and i prefer a German plug in a German car with Bosch electronics.

Spark plugs I put in it 15k miles ago were NGK 7968 Laser Platinum

I'm guessing they have been in there for 175k? NGK for the win.

I just completed my first spark plug change on my G20 330 at 40k miles. Three of them especially Cylinder 1 came out "wet" and I'm unsure if it's oil.

Those empi ones are trash

I just came across a recent problem while doing my spark plugs at 80,000 miles. The dealership was the one that did my spark plugs at 40,000 miles. Sure enough, they broke Cylinder 3\u2019s wiring harness connector to the coil pack and stripped the bolt. I had to helicoil the bolt, replace the connector, and repin the connector.