Belated follow up. I replaced the plug at the distributer as the signal from the hall sender was intermittent. Brand new Bosch plugs were had for cheap.
So I grab a new ignition coil, and a full set (4) of spark plugs. The Pre-gapped BOSCH Iridium plugs were the same price as OEM platinum, so I figured that's fine for me.
After pulling the plugs, Cylinder 1 plug was definitely eroded. The other 3 plugs looked fine, but I might as well replace the lot. The new Ignition Coil went into Cylinder 1 as well, and I started it up.
Check engine light went off, starts up fine, drives fine, idles fine.
Yeah, I'd rather use some cheap BOSCH SUPERS or other $2 copper plug than any Autolite.
Sometimes you just have to try a few sets. I have a '97 Jetta which had NGK plugs in it for close to 4 years. I went through two sets of NGK plugs and couldn't get the car to run. I switched to Bosch and it started right up and ran fine.
Since Iridium is tough, and there is platinum at the tip of the movable electrode, I bought Bosch Iridium.
Autolite 4162's, I changed them out every 1000 miles.
When we got our 535xi one of the first things I did was visit the local parts place to buy new spark plugs for the N54. After driving the car a while and visiting many BMW discussion boards I learned most folks have a very low opinion of them
I have solved so many drivability problems taking Bosch plugs out of misfiring engines.
Autolite made the only plug I've ever had that was dead when brand new.
In my experience, Bosch spark plugs are always terrible; fouling out within a month, that kind of thing...
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