FWIW, if you don't have Bosch, BERU, Bremi, or NGK plugs/coils and have store brand stuff, I stop diagnostic work until you get OE grade stuff put in there. BMW's don't like the Zone/ebay for ignition parts in my experience.
Yeah can go wrong with acdelco. I run Bosch in my 93 4.3
You can get the champion version of the RS7 plugs for less than $20 a plug and they’re working great on my car!
I've run Bosch iridium's in all my vehicles (boosted and daily). No gapping needed.
These were actually alright spark plugs. The ceramic is a lot tougher than normal ceramic, and the electrode is larger. They were marketed as 'truck plugs', but they're really good in old tractors and farm equipment. They last forever.
For spark, I wasn't sure I had the right plugs so I went with the OEM Champion plugs that were recommended in the Bentley. I checked for spark, no issues there.
But otherwise, Bosch FLR8LDCU+.
Champion plugs are barely adequate for a lawnmower...
Champions are crap.
I’ve heard bad things from mechanics about Bosch, specifically Bosch platinum.
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