I've been using Bosch FR8LDC in my car for years with good results.
Now running the Bosch +2 Platinums and my MPG jumped from about 21 to 25! A lot of others will tell you not to mess w/ the platinums but they are doing well for me.
OEM plugs which are NGK BKR5EKU used to get 26-28mpg @ 192k miles
after you get everything fixed don't run the oem plugs, they are too hot, if you want to run iridiums then get plugs that are 2 heat ranges colder and you'll be better off. you can also run copper plugs, i run ngk coppers that are 2 heat ranges colder and have had no issues at all.
I got... bosch platinum plus plugs... and you could feel the difference right away with the new plugs. started faster, idled smoother
I replaced my plugs with NGKs about 10k miles ago, I got them on amazon for about $12 a plug I think, engine runs great with them.
NGK BKR5E... Dual or single electrode, they both work well. These are the best plugs for these motors imo. They’re some of the cheapest as well.
I just installed STI plug wires and NGK spark plugs. After the install the car tried hard to turn over again but still gave me the same issue as before. Turns out the motor was not getting gas so I didn't need to get new plugs/wires, but I am glad I did because now my car doesn't idle weird anymore.
Bosch FR8DC+ perform well and you won't have to worry about seized plugs. You might have to change them sooner.
I put in a set of BP6ES today, gapped to .022", and had every bit the misfiring problems as before, and probably a bit more severe and more frequent.
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