Just turned over 100k miles on my 99 TL, so I'm pretty sure it's time to replace the plugs. What do you guys recommend?

 

NGK Iridiums. Denso Irdiums. the denso wont last as long as the NGK though

 

Just installed NGK iridiums. How long will it last?

 

Once again, thanks a lot.

 

not sure, probably as lon as the originals did. the Denso's are rated for like 30-40k

 

I think according to the manual, the oem plugs are replaced every 100K.

 

yea they are.

 

Any noticable gain in HP or gas mileage with the NGK's or Denso's?

 

just did bosch plus 4 plats --- pretty happy

 

teh NGK is a stock replacement so no, and i never noticed a difference with the denso's and you wont. if your replacing the originals with high miles on them you will notice an improvement (smoother idle quicker responce) over the old due to wear on the old.

many have had issues with them after some time.

 

Good deal. Many thanks, bro.

 

No Problem. Check out E-bay for the plugs.

 

got mine for $36 shipped.

 

love my ngk's

 

I bought regular Bosch Platinums for my 2000 TL around 100k miles, and I also took off the top plate of the intake and de-gunked a bit. I'm not too sure about the plugs, though. I sort of wonder if these are good for the TL, sometimes it's not as smooth, adn there's a stumble. Who knows if it's the plugs or not...I'd say get OEM replacements. I've considered replacing them, but I'm about to replace the whole car, so I won't.

 

thats what others have noticed with the bosch, rougher idle, stumbling, not as long life

 

that sux, i hope thats not hwat i am in for. i might just swap them out now