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[jerry]

the Bosch ones were virtually new, but I get your point. I really made the change because of the deteriotion of the leads. The ones I had on at first were genuine Honda ones that needed changing. At first I went for a "mid range" lead set that werent up to the job (even with new Bosch super4s) so I waited several weeks for some very expensive Honda leads from Japan. Again no joy and then saw deal that Tokyo Express had on the denso plugs and mag. leads.Spoke to them and ordered them, fitted them and it was like a new car. Take your point about it being more to do with the leads  than plugs perhaps but it still ran better with mag leads and denso plugs than it did with new genuine (expensive!!) Honda leads and new Bosch plugs.
                                                                   jerry

[Richard A]

NGK Iridium spark plugs, I changed the leads and put new GM plugs in my 2.5 v6 Elite, within 4k (6 weeks) one plug was down, changed for a new set (6) the same happened again, fitted the Iridium's, great, that was 30k ago with no problem since. 155k on the clock and still going strong.
regards
richard a

[cem_devecioglu]

NGK..better..

[M0T0RVATE]

Hi

I used Bosch Super4 in my Senator 3.0L. .......

You need to be careful what you put in a Senator. Some upset the gerabox ECU  :-/  :-/ don't ask me how...... something about spurious voltage spikes.  :-?  

Yes, I was very carefull with my Senator. The Super4 never gave me any problems tho, car pulls like a steam train...
Sold it in auction, just waiting for buyer to collect now...

 

[Kevin Wood]

NGK Iridium spark plugs, I changed the leads and put new GM plugs in my 2.5 v6 Elite, within 4k (6 weeks) one plug was down, changed for a new set (6) the same happened again, fitted the Iridium's, great, that was 30k ago with no problem since. 155k on the clock and still going strong.
regards
richard a

If an engine in standard tune is getting through standard plugs at this rate it points to another issue such as detonation, running too lean, or a plug heat range not suited to the engine IMHO.

Iridium plugs will survive more abuse than a standard plug but unless you have a very highly tuned, high compression engine I would not expect them to make any difference, hence it's not worth the extra money in an Omega.

In this case perhaps they are masking another problem?

Kevin

[Richard A]

Yes, I agree it can mask other problems.
In my case out of 2 sets of 6 plug, ie 12 GM plugs, 3 were found to be dud, maybe it was a bad batch. NGK Iridium plugs were £6 each but worth every penny.
regards
richard a