Spark plug Bosch or Denso

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.

Denso Iridium plugs work perfect in 2.0T Got them from Autozone for $8 each, smooth idle at start up and when warm, great response, made in USA.

Since Iridium is tough, and there is platinum at the tip of the movable electrode, I bought Bosch Iridium.

I've been running these Denso's for almost a year now, seems to be a good plug for the price! :thumbup:

I've personally ran these plugs in my car with 40+ psi of boost and lots of ethanol for the past 5 years. Great plugs!

Ik22 is one heat range colder than stock,and I have installed these in many 1.8T & FSI cars from stock/mild tune/heavy modded and worked great.

Denso iridium are great for turbo cars

NGK are also good, but in experience denso iridium works better when running more than 1 bar of presseure

Bosch FR8DC+ perform well and you won't have to worry about seized plugs. You might have to change them sooner.

iv had mor problems with a brand new bosh plug then any other plug.. even cheap knock off checker brands...

Every time I fill up I check my mileage, I could never get great MPG from the FR8DS, but the coppers were way better MPG wise. Throttle response was less as well. The Silbers always looked more sooty during inspections than the coppers. The silver plug will last longer.