ari07

It's time for me to change yet another set of sparkplugs. I have a 97 ES and was wondering if anybody had any suggestions on which spark plugs are the best. I was thinking about going with Denso Iridium, but I also heard NGK Iridium IX plugs were pretty good. Any ideas?

Pheonix

Only use Denso, or NGK plugs. Iridiums are the best, Followed by plat, then normal. Normal plugs last as long as the platinum ones, leaving Normal VS Iridium.
What you get into is the arguement as to why people use what they use.


Personally, it's a complete waste of money. The $1-2 NGK/Denso plugs last through plug change intervals. Iridium plugs can last 80-120,000 miles. The problems with them are they they cost $10-$15 a PLUG, and they STILL need to be taken out and cleaned at the recommended plug interval because of build-up on them.

Which brings us back to, why pay $10-15x the amount of money for something that still needs to come out at 60,000, or 90,000 miles.


Then again, if it engorges your member to pay $60 for six spark plugs who cares. You feel better about yourself.

Lexusfreak

I agree to use either NGK or Denso iridiums. Always get factory original equipment or OE. You might find the Denso in the IK20 stock number, these are NOT original OE plugs & will only last you 30,000 miles.

superpats

What is the reccomended mileage for stock plugs to be changed?

ari07

What do you think is better? Stock or aftermarket plugs? I'd say change the spark plugs every 60-90,000 miles. I guess you could wait 120,000 but I wouldn't recommend it if you wanna have your engine operating at peak performance.

Lexusfreak

Stock OE iridium plugs are your best choice for performance, fuel economy & longevity. According to the owners manual, they do not have to be changed unti 120,000 miles, but personally I would not use them in my own vehicle that long.

3000

Bosch platinum 4's are pretty strong but pricey. Go with what you want.

Lexusfreak

Iridium Denso or NGK are far superior to Bosch +4's.

Pheonix

Bosch has problems with weak spark developing after a few thousand miles of wear. Do no use them.
Stick with Denso, or NGK.

mcelligott

After a few years of seeing others use the iridium plugs in their cars, I would highly recommend them. They seem to last forever. I plan on using them after my car is tuned.

Lexusfreak

Yup, they are a bit more expensive than your average plug, but well worth it in the long run!

lexusk8

I have Denso Iridium plugs in my '01 ES, and for the last 27K miles or so, they have given me no problems at all

Stub333

WTF does pretty 'strong' mean?...Spark plugs are spark plugs but Bosch's work better in European cars, and should stay in European cars...

People, Nippon-Denso is what belongs in your Lexus so just stay with them...Japanese plugs belongs in Japanese cars, end of story.

Lexusfreak

Agreed! Not to mention Bosch (as far as I know) does not make a long life iridium plug to begin with!.

3000

Strong spark. And I said they were pricey...