Spark plug Bosch or Champion

I went with Bosch but you really can't go wrong with the 4 vendors you have listed.

Bosch Spark plugs Motul 0W-20 VW oil for the last two oil changes, about 3k miles on the current change AFE air filter Brake fluid flush within last year or so Coolant flush with VW fluid within last year or so Accessory drive belt New belly pan screws and fasteners

I always run champion platinum in the coil rail 4.0s. Sometimes engines are particular.

I ended up finding a post where somebody was having a similar problem that I was and one of the top comments on that post a guy had said word for word "I hope you don't have Bosch Platinum plugs in there." I ordered NGK ZFR5N copper plugs. I just received them this morning and got work. Gapped them to 0.035. Put them in. Done. Misfire gone. Runs perfect idles like butter.

at 100k km, I replaced (all Bosch) Plugs , Coils, starter, battery, voltage regulator (40).

So new Bosch plugs and red-top coils seemed worth the $109. Old spark plugs were pretty crusty, which made me feel better about doing it.

I am getting better MPG,but It seems a little lacking in the power dept. compared to the autolite copper I had in?!Especially as far as low end torque.

I then changed to a hotter plug the Bosch Platinum plugs and again gapped to .28. Once again the plugs fouled shortly after starting and driving for a few minutes.

Bosch finewires suck dong and AFAIK are not OE for anything even though they claim they're OE for practically every car on the road.

Bosch platinum are trash.