Originally Posted by bclexus

If you don't care about the emission warranty or if the car is getting close to 100k miles then there is absolutely zero need or benefit (in performance or economy) in replacing the spark plugs at the recommended 60k mile maintenance schedule. In fact, Iridium spark plugs will last and perform like new until the car has ¼ million miles or more on it. Original Equipment Denso Iridium spark plugs have been known to go well over 300,000 miles in Toyota/Lexus V6 engines with excellent performance and economy results.


__________________

Don't just take my word for it - that you're wasting both time and money replacing the OE Denso Iridium spark plugs at 60k miles. Take the word straight from Denso that their Iridium spark plugs will last beyond 100,000 miles. Is there any question why Lexus only trusts Denso spark plugs as original equipment in their vehicles?





https://youtu.be/YAQiFREQC3g