Spark plug Bosch or Autolite
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We both run Autolite Platinum and they fired up no matter how cold it is on the first try.
Pros: fires up easily, good in cold
Vehicle:
Volkswagen Corrado
I'm running the dual electrode Bosch plugs without any problems.
Pros: without any problems
Vehicle:
Volkswagen Jetta
For plugs I suggest the Platinum 4+. They are a little pricy, but very noticable performance change if you've been running bad plugs for a while (like me )
Pros: noticable performance change
Cons: a little pricy
Vehicle:
Volkswagen Jetta
I tried the 3923's and my car ran like arse - rough idle etc.
Cons: rough idle
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