Mk5 GTI spark plugs

[xxx_mojo_xxx]

T_T are you politely suggesting I remove the Densos and go back to a set of OEMs?

[Teutonic_Tamer]

T_T are you politely suggesting I remove the Densos and go back to a set of OEMs?

That is your call.  However, VW (actually, it is Audi who carry out the vast majority of engine development for the VW Group) test and fit spark plugs from all makes - Bosch, NGK, Beru, AC, even Champion - and then specify the best one.  If Densos were as good as they claim - how come NO Densos are recommended by VW or Audi for OEM fitment.

I've been in this game far too long to fanny about trying to chase the 'best' spark plug.  I have never, ever found an OEM spec plug to be unsuitable.  But I have come across many a non-genuine or non-OEM spec plug which has caused issues.

And Densos seem to have a similar but limited 'enthusiasm' in the biker community - but again cause frequent probs.  NGK are by far the best plugs in bikes - from both japs and italians.  I won't include Hardly Davidstows - because they are just two-wheeled tractors!

If you have gone for Densos, then I might politely suggest you have been swayed by marketing over engineering.

ETTO, though. 

[xxx_mojo_xxx]

LOL - you ooze passion.  It's an admirable trait, thanks for the help. 

[Teutonic_Tamer]

LOL - you ooze passion.  It's an admirable trait, thanks for the help. 

Call it passion - call it whatever you like.  Just tap up your friendly VW or TPS parts person - and ask them if ANY Denso plug has OEM approval.

And just to clarify, VW/Audi frequently list two competing plugs to satisfy individual preferences - for both the GTI and the RS4 - both Bosch and NGK plugs are listed.  On other engines, that choice may be sommat like Beru or Champion, etc.

[Hurdy]

The people who have had problems with the Denso IK24's burning out are the ones running higher power stage 2+ on K04's. Maybe you will be okay with the Denso's on a K03, but I can't say for sure. It just so happened that the Denso's started to fail when I was at the Nurburgring in April and so they killed my outright lapping ability. I had them on for around 3k miles and they were done. The OEM Bosch's simply took everything I threw at them and still looked virtually like new whenever I had them out to check

[Teutonic_Tamer]

The people who have had problems with the Denso IK24's burning out are the ones running higher power stage 2+ on K04's. Maybe you will be okay with the Denso's on a K03, but I can't say for sure. It just so happened that the Denso's started to fail when I was at the Nurburgring in April and so they killed my outright lapping ability. I had them on for around 3k miles and they were done. The OEM Bosch's simply took everything I threw at them and still looked virtually like new whenever I had them out to check

I don't think you can get a better testiment than that!

[micky 32]

I'm running the NGK iridiums and they are good though. Car runs sweet with my mods. Those bosch "super" ( i'm guessing they are not the same as the bosch OEM's?) They were absolutely awful!

[Teutonic_Tamer]

I'm running the NGK iridiums and they are good though. Car runs sweet with my mods. Those bosch "super" ( i'm guessing they are not the same as the bosch OEM's?) They were absolutely awful!

Bosch Super are generally a 'consumer' plug like what Halfrauds sell.  OEM Bosch plugs generally don't have any fancy 'padding' names.