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On 09/23/02 I posted a message "Bosch 4+ Platinum vs. OEM" which rec'd about 25 responses so the topic was interesting for a few.
Majority of the posts were in favor of OEM plugs, w/ one post about Denso Iridium (Mike)
I put those (Denso Iridiums) in my 850 NA, and I noted:
1. Decreased engine vibration
2. Better acceleration esp. at low-end torque such as when you accelerate from a full stop.
3. Similar gas mileage (around 19-20 mpg city driving w/ lot of stop-and-go)
*** I had Bosch 4+ before and they still look good after about 15K.
I decided to change them only because I do a lot of city driving w/ short trips and frequent stops. BTW, the owners manual says: "change every 30,000 miles. If you do a lot of high speed highway driving OR A LOT OF CITY DRIVING IT MAY BE NECCESSARY TO CHANGE PLUGS EVERY 15,000 MILES".
I expect these Iridiums will last at least 20,000 miles
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