Spark plug Bosch or OEM Audi

if not oem ACDelco get ones from the likes of ngk, or bosch.

Audi A3 spark plugs work like a charm. Stage 2+ & fully upgraded supporting hardware.

When I had dino burner cars, I did all of my own work, and always used Bosch Platinum plugs for my specific engine and heat. Iridium last the longest life, but are more sensitive to getting hot and causing pinging.

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

Since I've owned my 18 S4 i've done almost everything myself:

4 oil changes, spark plugs at 40k, 2 sets of pads and 1 set of rotors, both air filters.

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.

the plugs are brand new Bosch Double Platinum.... so then I went out, put them back in and was still a biotch to start....

I did not have good experiences with Bosch on another vehicle.

I have solved so many drivability problems taking Bosch plugs out of misfiring engines.