Anyone used the denso iridium plugs? They are about $12 each.

 

I am not sure but my mechanic told me that to Iridium plugs work better in Japanese cars and for Volvo's you should get platinum plugs. I was looking into the Iridium and was told Boshe Platinum are better for European cars. If I have been misinformed let me know.

 

I just installed NGK Iridium plugs, they are about the same price as you describe. problem? i'm not really sure. But according to NGK website, Iridium plugs are stronger than platinum.
http://ngk.com/sparkplug411.asp?kw=Iridium&mfid=1

 

Actually sound pretty good to me. I wonder what mech was talking about?

 

I've very rarely heard of a plain old set of copper plugs going bad or causing a problem. If I can get some coppers or platinums for $1 a piece, and they can handle the heat range of my engine, good enough for me. In the end, spark plugs are only a backup method of combustion anyhow. I'm sure the iridiums are great, but I'd never spend $12 a piece for spark plugs. I know very-well the arguments against what I just said, but solid platinums are $5 a piece. If you go with the denso's, let us know how it goes. I might learn something new. Take care!

Matthew

 

I was curious if you bought the Denso plugs and how they worked?

 

Is it common for the plugs to last 20,000 miles? I changed mine 3 times already. 1st time eith bosh platinum, 2nd time with volvo, 3rd time with autolite double platinum.

 

It not uncommon for plugs to last only 20,000 miles and there are many factors the impact the life of the plugs such as: fuel quality, fuel octane, ignition state, age of plugs, driving habits, engine mods, turbo charged vehicles, high compression engines, mileage per year and etc. Also, spark plug quality of manufacture, quality of engineering, quality of materials, quality of alloys used and engineered quality make a difference. To help, I'll need: how many miles for each set of plugs, time in service, gas octane used, driving habits "full time" and "part time" (this would be racing people on freeways on the weekends going from A to B for example), brand and model of spark plugs and the condition of the spark plugs (the gap before install and the gap after install, the color of the center electrode). The more info the better. Also the country, state and city would help as well.

Cheers,

Eric

 

The bosh platinum's are supposed to last 100,000 miles and I have seen them do it many times.

 

I agree Tech. I have used the single electrode plugs since they first came on the market. I have used them in American, British, German, Japanese, and now Swedish autos and swear by them! I guess you have to use what works for you as the brand of spark plugs, oil, brakes, and etc. are truly controversial with enthusiasts.
R.

 

I have had Denso Iridiums on my Volvo 850 for at least 3 years, w/ no problems w/ ignition at all. Well, I did not have problems w/ bosh or OEM either.
I felt at the time I could save time not having to change plugs as often - Denso claims 100K miles. After I installed iridiums, I thought that the car was accelerating slightly better, but it could have been placebo as well.
Hope, it helps.

 

I have come to the conclusion that what ever works for you is what you should stick with. It is interesting how many of us swear by a particular product...................but it all comes down to what product you have had the best experience with.
R.