anyone knows the Denso Iridium Spark Plugs fits on my 08 TL-S? if yes, whats the model number? and how many should i get? thanks.
sorry, this maybe repost, but i did search and its not working... don't know why....

 

I'm sure they make some that fit your car but why are you replacing plugs on an 08 model? Iridiums don't offer a performance advantage over copper, they offer longer life.

You need 6 of them.

 

NGK versus Denso has been tested by ziners and found denso last about 30k miles and needs replacement, while the ngk will do 70k miles at peak level- then hang in there to 100 if you insist.
The NGK usually cost less, combined with last longer = better beer?
We do have members putting extreme miles per month on their car to be able to tell the differance and actual lifespan before mileage drop starts

 

there are interesting articles on the net explaining iridium-platinum-unobtainium, the properties of each metal and reason for each-- and which is best for normal auto use.

ihatecars knows plugs related to drag racing, so I defer to his knowledge of the inner workings of the device

 

so which one offer performance on my car??

 

sounds like NGK is way better, but how about performance?

 

yes they are the way to go-
if you remove a stock spark plug- its going to be an NGK Iridium, so there is not signifigant performance change unless you have 70,000 miles on an 08 already, then plugs will help!
A hi flow air filter like k&N or a CAI intake will boost airflow and power a little bit.

Some members are testing E3 and Pulseplugs with minor improvement, but it was not a heads up test with new iridiums for a month then new test plugs for a month.
1 mpg on plug change at 70k miles can just be the new plugs are firing better.

 

amk
how do you see with those lights? 8000 lows an 10s onthe fog?!

 

Performance as far as hp, they're all the same at first, with plain old copper at the top.

The only "performance" advantage of iridiums is if you run the plugs to a high mileage where the coppers will wear out and the iridiums will be less worn.

I have platinums in mine now because I wanted one heat range colder and couldn't find it in iridiums. Since I change mine every 30K, I could probably run plain $1.99 plugs and never see a difference.

If you're really looking for that last bit of performance, index your plugs when you install them and run a slightly larger gap. This will make way more of a difference than copper vs iridium vs platinum, at least at the power levels the TL sees.

Just to reiterate, nothing wrong with iridiums, it's just that you won't see the benefit until many miles down the road. If I were you, I would not pull the plugs out.

 

ic... thanks for the advise.

 

just same as white low and yellow fog, 8000k is like light blue and 10000k is dark blue, the fog lights distance is prob. about 2 feets long from your front bumper, so you still can see your 8000k headlights. sorry my english is not that good... but i tried..... lolz

 

I had the Denso "K20" in my TL, not worth it. They only last til 30k miles, according to their website. I put the stock NGK back in. Stick with the stock NGK Iridiums.